13 out of 20 is 65%. To find this you can either divide 13 by 20, or the easiest way is to convert it so that the denominator (20) is 100. This method only works because 20 goes into 100 evenly. So you would multiply the both 13 and 20 by 5 (because 20 fits into 100 5 times) which would give you 65/100. This makes the percent much easier to calculate.
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13*20/100 = 2.60 dollars.
eg: 10% = .10 5%= .05 13%=.13 20%=.20
13% = 13 / 100 (simplest form)
65% is 65/100 = 13/20