4 dollars off, leaving 16 dollars.
$16 $20 = 100% $2 = 10% $4 = 20% $20 - $4 = $16
$12.80
$6.40
75% off $16 = $16 - (0.75 x $16) = $4
4 dollars off, leaving 16 dollars.
$16 $20 = 100% $2 = 10% $4 = 20% $20 - $4 = $16
40 % of 40 dollars = 40/100 * 40 = 0.4 * 40 = 16 dollars off 16 dollars off 40 dollars = 40 - 16 = 24 dollars
$35.00 - (16%) = $29.40
$16
$12.80
$6.40
75% off $16 = $16 - (0.75 x $16) = $4
$4 off so $12
If you take 80% of 80 dollars away, you are left with 16 dollars.
40% off $40 = $16 dollars, thus you should pay $24 for the item.
16 dollars is still 16 dollars!