Serges graduated commission scale pays him 3% on his first $30,000 in sales, 4% on the next

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Serge’s graduated commission scale pays him 3% on his first $30,000 in sales, 4% on the next $20,000, and 6% on all additional sales in a month. What is his average commission rate on sales for a month totalling:
a. $60,000?
b. $100,000?
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