If you mean 20% then it is 7 dollars
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20 dollars added to 5 dollars is 25 dollars (not 35).
it's possible only if there are 20 cent coins only for that 7 dollars 1 dollar = 100 cents, 100 cents = 5 of 20 cent coins since you need 5 of 20 cent coins for a dollar, you do 7 times of it. 7 X 5 = 35. Therefore, you need 35 of 20 cent coins for 7 dollars. (or there are 35 of 20 cent coins in 7 dollars)
7 dollars - giving you a new total of 28 dollars. All without the aid of a calculator !
$1 = 20 nickels $527 = 10 540 nickels
Well, isn't that a happy little question! To make 700 dollars, you would need 35 twenty dollar bills. Just imagine all the beautiful things you could do with that much money! Happy painting!