Julio is paid on a graduated commission scale of 5% on the first $20,000 of sales in

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Julio is paid on a graduated commission scale of 5% on the first $20,000 of sales in a month, 7.5% on the next $20,000, and 10% on all additional sales.
a. What is he paid for a month in which his sales are $54,880?
b. What single commission rate on all sales would result in the same earnings for the month?
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