if tim had lunch at $ 50.50 and he gave 20 % tip , how much did he spend ?
"the tip is 20 % of what he paid for lunch . hence tip = 20 % of 50.50 = ( 20 / 100 ) * 50.50 = 101 / 100 = $ 10.10 total spent 50.50 + 10.10 = $ 60.60 correct answer b"
add(50.50, divide(multiply(50.50, 20), const_100))