15% * 18 pound = 2.70 pound.
18 - 2.7 = 15.30 pound
However if you misspelled and actually mean 15 percent of18, then the answer is 2.70 pound. ("off" means 18 minus 15% of 18)
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Ans = ₤18 * (1 - 10%) = ₤18 * (1 - 0.1) = ₤18 * (0.9) = ₤16.2
83.33%
18 percent of 15 is 2.7
15% of 120 is 18, 350% of 18 is 63.
45% of 40 per pound = 18 per pound