The sales commission of a pharmaceutical distribution company is structured such that its part-time sales representatives receive commissions of 5% on the first $10,000 they sell, 7% on the next $10,000, and 10% thereafter. Ivory, a new part- time sales representative of the company, has sales of $2000 in the first month, $11,000 in the second month, and $36,000 in the third month.

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

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

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