John Runs a Computer Software Store

Multiple Choice

John runs a computer software store. He counted 120 people who walked by his store in a day, 57 of whom came into the store. Of the 57, only 20 bought something in the store. Estimate the probability that a person who walks by the store will come in and buy something. Round your answer to the nearest hundredth.

A) 0.17
B) 0.35
C) 0.11
D) 0.64
E) none of these choices