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Easiest way I did this was find 20% of 160 and minus it from 100% of 160.

Eg. 100% of 160 = 160 , 20% of 160 = 32, 160-32=128 = 80% of 160

put this in a calculator : (128/160)x100 should equal 80

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14y ago

What else can I help you with?