The local farmers' market usually sells potatoes for $0.90 per pound. on fridays, they sell potatoes at a 30% discount. the market also sells cantaloupes for $3.50 each. which of the following represents the total cost, c , if a customer buys 2 cantaloupes and p pounds of potatoes on a friday?
A. c = 0.63p + 7
B. c = 0.9p + 7
C. c = 0.3p +3.5
D. c = 0.9p + 3.5