x / 5 = 80 / 25
x = 80 / 25 * 5
x = 16
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80% of $25 is $20, so 80% off would be $5.
89 x 20 = 1780 89 x 5 = 445 80 x 20 = 1600 9 x 20 = 180 80 x 5 = 400 9 x 5 = 45
1/5 x 16/80 = 1/5 x 1/5 = 1/25
5 x 5/6=25/6 or 4 1/6
25% = 25/100 = 1/4 (1/4) X 80 = 80/4 = 20