if tim had lunch at $ 60.80 and he gave 20 % tip , how much did he spend ?
the tip is 20 % of what he paid for lunch . hence tip = 20 % of 60.80 = ( 20 / 100 ) * 60.80 = $ 12.16 total spent 60.80 + 12.16 = $ 72.96 correct answer c
add(60.8, divide(multiply(60.8, 20), const_100))