Naren practice free throws every morning before he goes to school. This morning, Naren made 42 out of 60 free throws. Which proportion could be used to find x, the percent of free throws Naren made?

A = 42/100 = x/60

B = 18/60 = x/100

C = 100/x = 42/60

D. 42/60 = x/100

100 * 42/60 is the answer (percent is 100 times fraction)

so working backwards
x = 100 * 42/60
x /100 = 42/60
D