Post on 31-Mar-2015
transcript
2.7 – Percent of Change
Percent Change: Change = x _
Original 100
Percent Change: Change = x _
Original 100
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _
Original 100
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _
Original 100 3 = x _
20 100
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _
Original 100 3 = x _
20 100
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _ Original 100
3 = x _20 10020x =
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _ Original 100
3 = x _20 10020x = 300
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _ Original 100
3 = x _20 10020x = 30020 20
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 20New: 23
Change = x _ Original 100
3 = x _20 10020x = 30020 20 x = 15; New greater than Orig., so INC
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 25New: 17
Ex. 1 Determine whether each percent of change is a percent of increase or decrease. Then find the percent of change.
a) Original: 25New: 17
Change = x _ Original 100
8 = x _25 10025x = 80025 25 x = 32; New less than Orig., so DEC
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price T = $28.62 + 7.25%($28.62)
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price T = $28.62 + 7.25%($28.62) T = 28.62 + 0.0725(28.62)
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price T = $28.62 + 7.25%($28.62) T = 28.62 + 0.0725(28.62) T = 28.62 + 2.07495
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price T = $28.62 + 7.25%($28.62) T = 28.62 + 0.0725(28.62) T = 28.62 + 2.07495 T = 30.69495
Ex. 2 Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62. If the tax is 7.25%, what is the total cost?
Total Cost = Price + Tax of Price T = $28.62 + 7.25%($28.62) T = 28.62 + 0.0725(28.62) T = 28.62 + 2.07495 T = 30.69495 T = $30.69
Ex. 3 Marta is purchasing a pair of jeans. The jeans cost $85. If they are on sale for 20% off, what is the total cost?
Ex. 3 Marta is purchasing a pair of jeans. The jeans cost $85. If they are on sale for 20% off, what is the total cost?
Total Cost = Price – Discount of Price
Ex. 3 Marta is purchasing a pair of jeans. The jeans cost $85. If they are on sale for 20% off, what is the total cost?
Total Cost = Price – Discount of Price T = $85 – 20%($85) T = 85 – 0.2(85) T = 85 – 17 T = 68 T = $68