arnold buys 3  35  pounds of green grapes for $1.85 per pound. he buys 3  35  pounds of red grapes for $2.30 per pound. which expression can be used to determine the total cost, in dollars, of the grapes arnold buys? a)3.6(1.85 + 2.30)b)3.6 • 1.85 • 2.30c)(3.6 + 3.6)(1.85 + 2.30)d)(3.6 • 3.6) + (1.85 • 2.30)