Unit 2 – Percentage Review

Mr. Otto wanted to build a garage. Therefore, he had to borrow money from the bank. He borrowed $7,000 at a rate of 5% for 30 months.

What is the amount of interest he had to pay on the loan?

I = Prt I= $7,000(.05)(30/12) I= $875

Dr. Winslow wants to open a medical office in Levering but does not have the money to do so. Therefore, he gets a loan from the bank. He borrows 120,000 at an interest rate of 8% which is compounded semi-annually for 9 years.

How much will he pay back altogether?

A= P(1 + r/n)n*y

A=$120,000(1 + .08/2)2*9

A=$120,000(1+ .04)18

A= $120,000(1.04)18

A= $243,097.98

A $900.00 Dell Laptop was marked down 25% for a Christmas special. It did not sell on Black Friday so it was marked down another 15%. It still did not sell so it was marked down another 10% and it sold then within an hour.

How much did the laptop sell for?

Remember use the % it is actually worth –NOT the % discount.

$900 (.75)(.85)(.90) $516.38

Raymond gets paid $550 for dropping off scrap metal to the junk yard. His scrap totals 2.75 ton. What is the price he is paid per ton of scrap metal?

Price per ton? $550/2.75 ton $200 per ton

Gracie needs to borrow $1,000 to buy the dog of her dreams. She borrows the money from Capital Bank at a rate of 6.5% for 5 years.

What is the total payback amount?

I = Prt I= $1,000(.065)(5) I= $325 $1,000 + $325 = $1,325

A new Camaro costs $45,000 brand new. The car depreciates in value 22% each year. What will it be worth in 7 years?

Remember use the % it is ACTUALLY worth! $45,000(.78)7

$7,904.51

30 = ______% of 75

Is/of and %/100% 30/75 n/100% Cross multiple 30 * 100 = 3000 3000 / 75 = 40%

You buy an IPod touch for $258 with 6 % sales tax. What is the total price?

Always start with 100% 100% + 6% ($258) 106% ($258) 1.06($258) $273.48

What is the simple interest rate for a snowboard that costs $680 with a loan for 2 years and interest of $170?

Work backwards from I=Prt $170 = $680(r)(2) $170 / $680 / 2 .125 = 12.5%

42 is between what two perfect squares?

First find the square root of 42 6.48 so it is between 6 and 7 6’s perfect square is 6 * 6 = 36 7’s perfect square is 7 * 7 = 49 36 & 49

The cube root of 189 is between what two integers?

To find the cube root you need to put the number to the 1/3 power.

5.74 5 & 6

All of the images in this review presentation were thanks to Google Images !!