Choose the method of pay that would result in the most earnings for one month on sales of $73,620.a.Straight commission of 6% on all sales.b.Monthly salary of $3,000 plus 2% commission on all sales.c.Graduated commission of 4% on the first $50,000 in sales and 9% on anything over that.d.Graduated commission of 5% on the first $35,000 in sales and 7% on anything over that.