Divide both numbers by their HCF.
So 80/100 = 4/5
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80 over 100 is 0.8.
49/80 can't be reduce into a whole number but the answer is 0.61
80/100 = 130/X --> 80*x = 100*130 --> 80x = 13,000 --> 13,000/80 = x --> x = 162.5
% rate = 20%=16/80* 100%= 0.2* 100%= 20%
80%% rate:= 60/75 * 100%= 0.80 * 100%= 80%