The Customer Service Department of H&R Block Received a Total

Multiple Choice

The customer service department of H&R Block received a total of 235 telephone requests for a tip-
Sheet on personal tax or corporate tax. The following table summarizes callers' primary area of
Interest, and how they first heard about the tip-sheet.
What is the probability a caller became aware of the tip-sheet either by radio or newspaper given
Her primary interest is corporate tax?

A) 106/135
B) 36/135
C) 70/135
D) 90/235
E) 160/235