70
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90 minus 30 percent - and therefore 30 percent OFF the number, is equal to 90 x (1 - (30 / 100)) = 90 x (1 - 0.3) = 90 x 0.7 = 63. 30 percent OF 90 is equal to 90 x (30 / 100) = 90 x 0.3 = 27
30% off of £90 = £63 = 30% discount applied to £90 = £90 - (30% * £90) = £90 - (0.30 * £90) = £90 - £27 = £63
30% off $90 = $90 - (0.3 x $90) = $63
-30%
55 is the middle number on a number line from 20 to 90.