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

$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.