A small business uses Google search engine advertising to sell its products. Here are some details: . The cost per click is $0.50 The number of clicks per month is 500 . The conversion rate is 5% . The profit per sale is $20 What is the cost per acquisition (CPA)? Please choose the closest number below. Select one: O a. $10 O b. $15 O C. $20 O d. $25 Clear my choice