The quickest way is to multiply the original number by 0.9
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Straight off the top of my head - without any help from a calculator.... 10 dollars !
7.4 is 10 percent of 74. If you take 7.4 off of 74 the result is 66.6 in total. If you literally take 10%, which is 0.1 off of 74, then 73.9 is the result.
30% of 10 is 3. You can find that out by typing in 10 x .03 in a calculator! Or you can notice that 10% of 10 is 1 and 30% is 3x10%=3.
10% = 15.40/10 = 1.54 So 30% = 1.54 x 3 = 4.62 So 15.40 - 4.62 = 10.78
type the amount into a calculator and take away the precentage. for example £10-50% = £5 :D