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First of all, you need to know that percent simply means "in one hundred". To figure out what percent of 400 is 160, you start with a fraction:

160/400

Now you need to reduce that fraction by dividing:

160/400 / 80/80 = 2/5

Now you need the denominator to be 100. So you have to multiply:

2/5 x 20/20 = 40/100

Then you just need to replace /100 with %, and you get

40%

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14y ago

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