Question

What is the percent decrease between 80 and 64

Answer 1

80-64/80 x 100 = 20%

Ans : 20%

Answer 2

we know that

The number $80$ represent the $100$%

Find the percentage of the number $64$

by proportion

$\frac{80}{100} =\frac{64}{x} \\\\ 80*x=64*100$

$x=\frac{64*100}{80}$

$x=80$%

Find the percentage decrease

Percentage decrease=$100-80=20$%

therefore

the answer is

The percentage decrease is equal to $20$%