what is the total cost of 2 sandwiches at $ 1.49 each and 4 sodas at $ 0.87 each ?
answer = b 2 * 1.49 + 4 * 0.87 = 2 ( 1.50 - 0.01 ) + 4 ( 1.00 - 0.13 ) = 3 + 4 - 0.02 - 0.52 = 7 - 0.54 = 6.46
add(multiply(2, 1.49), multiply(4, 0.87))