Question

A lamp is on sale, and its price is reduced from $80 to $50. What is the percent of decrease?

Answer 1

It's 37% put 80-37% and it will give u 50

Answer 2

$\frac{30}{80}$ is the fraction of decrease. Converting this to a fraction with a denominator of 100, we get the fraction; 
$\frac{37.5}{100}$
Now we just take the numerator of the number to get the percent, which is the solution. 

37.5%