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how to calculate total if you know percent. P e r c e n t 100 p a r t i a l a m o u n t t o t a l a m o u n t x The total amount is the unknown quantity x that we need to find. If you have a starting amount and you want to add a percentage simply multiply the percent by the original amount to find the amount that gets added.
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Youll gain access to interventions extensions task implementation guides and more for this instructional video. If you know the percentage and one of the needed numbers you can find the unknown number using either the shortcut method or the proportion method. If you have a starting amount and you want to add a percentage simply multiply the percent by the original amount to find the amount that gets added.
First find the total.
First consider the unknown original amount as x. Note the value of the percentage. To find the increase or decrease multiply the rate by the original amount x. The percent rate new value and original value are the central figures in the percentage equation.
