20% of 135 pounds is (20/100) x 135 = (1/5) x 135 = 27
So 135 pounds minus 20% discount = 135 - 27 = 108
Another way of looking at this is that after a discount of 20% the object really costs only 80% of the original price, hence
135 pounds minus 20% discount = 80% of 135 = (80/100) x 135 = (8/10) x 135 which is equal to (4/5) x 135 = 4 x 27 = 108
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45% discount on 300 = 165 = 300 - (45% * 300) = 300 - (0.45 * 300) = 300 - 135 = 165
It depends on the discount percentage. Assuming 10%, and 135 is actually £135, then the original price was: 135 x 10 = £1350.00
162 - 135 = 27
135 = 13,500 percent
70 percent of 135 is 94.5