Question

find the percentage change when a number is changed from 6.25 to 7.50

Answer 1

Initial value=6.25

final value =7.50

Change=1.25

Percentage change=1.25/6.25×100=20%

Answer 2

Initial value = 6.25
Final value = 7.5
Change = 7.5 -6.25 = 1.25
∴ Percentage change = $\frac{change×100}{initial value}$ %
       = $\frac{1.25*100}{6.25}$ %
       = $\frac{100}{5}$ %
       = 20% 
∴ The change is 20%