x - 0.5% = 500 x - .005 = 500 x - .005 + .005 = 500 + .005 x = 500.005 Check: x = 500.005 500.005 - 0.5% = 500 500.005 - .005 = 500 500 = 500 So x - 0.5% = 500 when x is .005.

One half of a percent as a decimal is expressed as .005 Percent is out of 100 or 1 in most cases. 99 cents equal 1 dollar, so one HALF of ONE percent is .005 because one out of 100 = .01 so half of that would be .005 because .005 + .005 = .01