30% off of 40 dollars = 70% [left] of 40 dollars = 40*70/100 = 28 dollars
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you do 40*.25 and get 10. that means you have $10 off and the new total is $30
Is this 60% OFF OF 30 dollars or 60% OF 30 dollars? 60% OF $30 is 30*.60 = $18 60% OFF of $30 would be subtracting that 60% off of it. $30 - $18 = $12 60% OFF of $30 would be the same as 40% OF $30
40 % of 40 dollars = 40/100 * 40 = 0.4 * 40 = 16 dollars off 16 dollars off 40 dollars = 40 - 16 = 24 dollars
40% off $40 = $16 dollars, thus you should pay $24 for the item.
40% of 120 dollars = 120*40/100 = 48 dollars. So 40% off = 120 - 48 = 72 dollars.