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40 % of 54.95 = (40 / 100) * 54.95 = 0.4 * 54.95 = 21.98 subtract from 54.95 = 32.97 (40 % reduction)
To calculate 'percent off' you can subtract the percent from 100%, then multiply by the amount, or multiply the percent by the amount, then subtract that from the original amount: 100% - 40% = 60%. (60%) x $80 = $48 (so $48 is the new price). (40%) x $80 = $32 (the amount of the discount is $32). $80 - $32 = $48
100. 250/100*40=100.
40 is 100 percent. 40/100 = 0.4 is 1 percent. 30/0.4 = 75 percent.
Start with the original, and subtract 40 percent: 230-(0.4 * 230) = 138