It is 90%.
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% rate= 72/80 * 100%= 0.9 * 100%= 90%
The Least Common Multiple (LCM) of 72 and 80 is 720.
% rate = 90%=72/80 * 100%= 0.90 * 100%= 90%
Nine tenths of 80 is calculated by multiplying 80 by 0.9. This results in 72. Thus, nine tenths of 80 equals 72.
52 < (80 + 72)