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A salesman earns a basic salary of sh 7500 per month. He earns no commission on the first sh 30000 worth of goods he sells each month. He paid a commission of 5% on all sales above sh 30000. In a certain month he earned a total income of sh 14250. What was his total sales for that month?
A. Sh 135000
B. Sh 285000
C. Sh 165000
D. Sh 315000