20.00...
16* * * * *That is 40% of 40 NOT 40% off of 40.40% off of 40 is 60% of 40 which is 40*60/100 = 24
83.996
40 % of 40 dollars = 40/100 * 40 = 0.4 * 40 = 16 dollars off16 dollars off 40 dollars = 40 - 16 = 24 dollars
64