Nitin Is Paid on a Graduated Commission Scale

Multiple Choice

Nitin is paid on a graduated commission scale. He receives commission at the rate of 2% for the first $10,000 of sales in a month, 3% on the next $20,000, and 4.5% on all further sales. What is Nitin's average rate of commission in a month in which his sales are $60,000?

A) 3.167%
B) 3.417%
C) 3.583%
D) $5
E) 3.83%