Reducing something by 30% involves working out what 30% of it is, then subtracting that amount.
30% of 640 means 30 hundredths of 640.
One hundredth of 640 is 6.4, so 30 hundredths is 30 x 6.4 = 192
30% of 640 = 192, so 30% off 640 = 640 - 192 = 448
30% of 640 = 30% * 640 = 0.3 * 640 = 192
30 percent percent of 6.40 = 0.0030 x 6.4 = 0.0192
It is: 12.6 dollars
30% off of 640 = 640 - (0.30 x 640) = 448
It is: 18 -5.4 = 12.6 dollars
30% = 3⁄10
70 - 30% = 49
30% = 3⁄10
12.6 reduced by 30% = 8.82
3/10
30%= 30/100 simplified to 3/10
If 31.50 is the reduced price, the original price was 45.00.