what is the total cost of 2 sandwiches at $ 2.44 each and 4 sodas at $ 0.87 each ?
"answer = c 2 * 2.44 + 4 * 0.87 = 2 ( 2.50 - 0.06 ) + 4 ( 1.00 - 0.13 ) = 5 + 4 - 0.12 - 0.52 = 9 - 0.64 = 8.36"
add(multiply(2, 2.44), multiply(4, 0.87))