A manufacturer of water purifiers offers sales people the following commission structure: 2% for the first $5000 they sell, 3% on the next $3000, and 5% thereafter. Larisa, a new sales representative, has sales of $6000 in the first month, $10,000 in the second month, and $15,000 in the third month.

a. What were her commissions for the first three months?

b. What single commission rate would represent her earnings in the third month?

AppendixLO1