45% The percentage of alcohol is always 1/2 of the proof.
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The percentage change from 70 to 90 is +28.5714%
0.6 proof 0.6 x 90 = 54 alternatively, you could say that 54 is 60% of 90
45 out of 90= 45 / 90= 0.5Converting decimal to a percentage: 0.5 * 100 = 50%
27 is what percent of 90:= 27 / 90= 0.3Converting decimal to a percentage:0.3 * 100 = 30%
90%% rate:= 45/50 * 100%= 0.90 * 100%= 90%