Question

► Find the percent change and tell whether it is a percent increase or a

percent decrease.

1 Original amount: 20
End amount: 15

2 Original amount: 30
End amount: 45

3 Original amount: 625
End amount: 550

4 Original amount: 320
End amount: 112

5 Original amount: 165
End amount: 222.75

6 Original amount: 326
End amount: 423.80

7 Original amount: 27
End amount: 38.61

8 Original amount: 60
End amount: 70.02

Answer 1

1 Original amount: 20

End amount: 15

(20 - 15)/20 x 100 = (5/20) x 100 = 25% decrease

2 Original amount: 30

End amount: 45

(45 - 30)/30 x 100 = (15/30) x 100 = 50% increase

3 Original amount: 625

End amount: 550

550/625 =550 ÷ 625 =0.88

0.88 =0.88 × 100/100 =(0.88 × 100)/100 =88/100 =88% decrease

4 Original amount: 320

End amount: 112

(112-320):320x100 =

100 =(112:320-1)x100 =

100 =35-100 = -65% decrease

5 Original amount: 165

End amount: 222.75

165/222.75 =165 ÷ 222.75 ≈0.740740740740741

0.740740740740741 =0.740740740740741 × 100/100 =(0.740740740740741 × 100)/100 ≈74.074074074074/100 =74.074074074074% ≈74.07% Increase

6 Original amount: 326

End amount: 423.80

(423.8-326):326x100 =

100 =(423.8:326-1)x100 =

100 =130-100 = 30% Increase

7 Original amount: 27

End amount: 38.61

(38.61-27):27x100 =

100 =(38.61:27-1)x100 =

100 =143-100 = 43% Increase

8 Original amount: 60

End amount: 70.02

(70.02-60):60x100 =

100 =(70.02:60-1)x100 =

100 =116.7-100 = 16.7% Increase