Havel signed a listing agreement with a realtor. The commission rate is 4% on the first $200,000

Question:

Havel signed a listing agreement with a realtor. The commission rate is 4% on the first $200,000 of the selling price, and 2.5% on the remainder.
a. What commission will Havel pay if he sells his home for $289,000?
b. What is the average commission rate on the selling price?

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