GMAT Math Practice Test #1

Answer: C - First convert decimal into its fraction. For this write the number without using decimal as the numerator and write 1 followed by zeroes as denominator. The number of such zeroes is equal to the total number of digits to the right of the decimal points. Then simplify the fraction.
0.0125 = 125/ 10000 = 1/80

Key takeaway: Decimals and fractions are two different ways of expressing same thing. Every fraction can also be converted into decimal; all you have to do is to divide the numerator by the denominator.