Mr. Thompson sold 4 vacuum cleaners in the first month. In the second month, he sold 3 times as many vacuum cleaners as the first month. In the third month, he sold 5 times as many vacuum cleaners as the first month. a. How many vacuum cleaners did Mr. Thompson sell in the three months?

Mr. Thompson sold
vacuum cleaners in the three months. b. He sold the vacuum cleaners for $435 each. How much money did Mr. Thompson earn? (Be sure to put a comma in your answer.)

Mr. Thompson earned $
.