what is the total cost of 2 sandwiches at $ 3.49 each and 4 sodas at $ 0.87 each ?
"answer = d 2 * 3.49 + 4 * 0.87 = 2 ( 3.50 - 0.01 ) + 4 ( 1.00 - 0.13 ) = 7 + 4 - 0.02 - 0.52 = 11 - 0.54 = 10.46"
add(multiply(2, 3.49), multiply(4, 0.87))