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. What single commission rate on all sales would result in the same earnings for the month, as on sales of $60,000? Question 2 options: 5.5% 7.5% 8.5% 6.5%