Anticipatory Set Yesterday I went to Target with my coupon
book, ready to buy a new flat screen television for $550.99. If I
were to buy the flat screen before the winter sale was over, I
would receive a 20% discount. Am I getting a good deal? Today you
are going to help me figure that out. Should I but it or save my
money? Lets ftake a look and see!
Slide 4
California State Standards Number Sense 1.4 Calculate given
percentages of quantities and solve problems involving discounts at
sales, earned interest and tips.
Slide 5
Language of the Discipline Tip Discount Total Cost
Slide 6
What is a Tip? (Input) A TIP is a gratuity or bonus paid out on
top of the original amount of a bill to a server or worker. Here, a
percentage is assigned as a TIP and is given in addition to the
original amount of the bill. TIPS are easily calculated using a
simple math function.
Slide 7
How to Calculate a Tip (Input/Modeling) When you are
calculating a TIP, please remember that you will need to follow a
set order of steps to solve. Step 1: Convert your TIP Percentage
into a Decimal. Step 2: Multiply the decimal by the amount of the
bill. Example: 15% tip on a bill of $60.00 (0.15)($60.00) = TIP
$9.00 = TIP
Slide 8
How to Calculate a TOTAL Bill Including Tip. (Input/Modeling)
Not only can a TIP be easily determined, but the TOTAL amount of a
bill INCLUDING the TIP can be solved for as well. Remember that the
TOTAL bill can be thought of as the following: Original Amount +
TIP Amount = Total Bill Example: Your Dinner Bill is $50.00 and you
want to leave a 20% TIP. 20% can thought of as 0.20. TIP is solved
as ($50.00)(0.20) = $10.00 Original Amount + TIP Amount = Total
Bill ($50.00) + ($10.00) = Total Bill $60.00 = Total Bill
Slide 9
Calculating the Total Bill (Input/Modeling) Example: Mr. Smith
and his family went to Marie Callendars for dinner and received a
bill for $80.00. He decided to give his waitress a TIP of 20%. What
would be the cost of the TOTAL Bill? Hint: ORIGINAL Cost + TIP =
TOTAL Bill. Please solve.
Slide 10
Alternate Method to Solve a Total Bill (Input/Modeling) Another
way to solve for the TOTAL Bill is to rethink how you you set up
the problem. Here lets look at the following example: Bill is
$120.00 and the TIP is 15%. Instead of solving TIP first and then
adding it to the ORIGINAL Bill, you can solve it in a different
manner. Here think of the MULTIPLIER as the following: Original
Bill + TIP Percent = TOTAL Bill 100% + TIP = TOTAL Bill 100% + 15%
= 115% 115% = 1.15 ($120)(1.15) = TOTAL Bill $138.00 = TOTAL
Bill.
Slide 11
What is a Discount? (Input) A discount is an amount REMOVED
from the Original Cost of an item. Discount Amount is determined by
completing the following steps: Step 1: Convert your DISCOUNT
percent into a decimal. Step 2: Multiply the ORIGINAL Amount by the
DISCOUNT Percent. The result is the DISCOUNT Amount.
Slide 12
What is the SELLING Cost? (Input) Selling Cost can be
determined in 2 different ways Solution 1: -Calculate the DISCOUNT
and then subtract it away from the ORIGINAL Cost. Solution 2: -
Determine what will be remaining from the ORIGINAL Costs starting
percentage of 100% and the DISCOUNT percent. -The remainder of the
ORIGINAL 100% can then be used as a multiplier.
Slide 13
How to Calculate Selling Cost Selling Cost is the ORIGINAL COST
of an item LESS the DISCOUNT AMOUNT. ORIGINAL Cost DISCOUNT Amount
= SELLING Cost Hint: Remember that when you DISCOUNT something, you
are NOT paying for the entire amount. By taking away the DISCOUNT
you then have the SELLING Cost. Example: You buy an item and get a
20% discount, therefore you are paying for only 80% of the cost of
the item. 100% - 20% = 80%
Slide 14
How to Calculate a Discount: Example #1 (Modeling) Example #1:
An LSU sweatshirt costs $72.00. There is a 40 % discount. How much
will the discount be? 40% =.40 (72.00)(0.40) = 28.80 $28.80 Step #!
Convert the percent into a decimal. Twice to the left! Step #2
Multiply the decimal an the dollar amount. Step #3 Solve to find
the discounted amount
Slide 15
How to Calculate a Discount: Example #2 (Modeling) Example #1:
A new iPhone 5 costs $600.00. There will be a 20% discount. What is
the new price? 20% =.20 (600.00)(.20) = 120.00 600.00 120.00 =
480.00 $480.00 Step #! Convert the percent into a decimal. Twice to
the left! Step #2 Multiply the decimal an the dollar amount. Step
#3 Solve to find the discounted amount
Slide 16
Check for Understanding Please determine the BEST answer for
the following question. Please write your answer on your white
boards and wait for the teachers signal. On the teachers signal,
hold up your white boards.
Slide 17
Checking for Understanding Question #1 You and your friend eat
lunch at a restaurant. The bill is $22.76. How much would a 15% tip
be?
Slide 18
Checking for Understanding Question #2 Find the total cost of a
$35.44 meal and a 15% tip.
Slide 19
Checking for Understanding Question #3 A new kitchen table
costs $675.00. It is now on sale for 35% off. What is the
discounted amount?
Slide 20
Checking for Understanding Question #4 A skirt at Forever 21
costs $30.00. It was moved to the sale rack and now has a 40%
discount. How much is the cost of the skirt after the
discount?
Slide 21
Guided Practice/ Independent Practice Guided Practice Complete
textbook pg 260. #15-17 Raise your hand and wait for a stamp. If
you get an R on your paper, please go to the back table with Ms.
Graham Independent Practice Please come textbook pg 260.
#18-20