10 per cent of 1800 is 180 so 10% off of 1800 is 1800 - 180 = 1620.
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10% off $18 = $18 - ( 0.1 x $18) = $16.2
Ans = ₤18 * (1 - 10%) = ₤18 * (1 - 0.1) = ₤18 * (0.9) = ₤16.2
18
10 ÷ 100 × 18 = 1.818 - 1.8 = $16.2
10% off 180= 10% discount applied to 180= 180 - (10% * 180)= 180 - 18= 162