Quick percent trick

Took me 0.21 seconds to get the answer.

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Also, percentages are reversible. So 7% of 300 is the same as 300% of 7, which also means 7 x 3

7% of 100 = 7 multiply by 3 = 21

21

21 =7×3=21

I don't think thats right....

21

not a trick, its quick math, you either have the skill or you don't

You should just be able to tell just by looking at the options in this case?

I prefer the following equation Let assume the Q? What is the 15% of 50 The A is 15 *(50/100) 15 * (1/2) 15/2 7.5 _________ If number change from 50 to 230 for example 15 * (230/100) 15 * 2.3 34.5