Question

Shalika bought a purse for $120. The tax rate is 9%.

Which proportion can be used to find the amount of tax Shalika will pay?

A.
9/120=x/100

B.
120/x=100/9

C.
x/120=100/9

D.
120/9=100/x

Answer 1

$120 is .........  100% of the price
    x .................    9% of the price
x represents tax money in dollars
now we use cross-multiplication
120*9=x*100

we can divide both sides with x and with 9 and we get:
120/x = 100/9

Answer is B.