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10% off is the same as 90% left. 90% of 65 dollars = 65*90/100 = 58.50 dollars.
Okay. The 'full amount' of something is one-hundred percent. Half of one hundred is fifty. For example, if something costs five-hundred dollars and it was on special in a shop, it would cost two hundred and fifty dollars. So if an advertisement says something is fifty percent off, it means half off the original price.
17 dollars.
70% of 17.50 taken off of it leaves 5.25 as the total.
25 percent of 18 dollars is 18*25/100 = 4.50 dollars So 25% off of 18 dollars is 13.50 dollars