the same average monthly earnings as 15. 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? fO200 nluan