if tim had lunch at $ 50.20 and he gave 20 % tip , how much did he spend ?
"the tip is 20 % of what he paid for lunch . hence tip = 20 % of 50.20 = ( 20 / 100 ) * 50.20 = $ 10.04 total spent 50.20 + 10.04 = $ 60.24 correct answer e"
add(50.20, divide(multiply(50.20, 20), const_100))