Decimal Fraction - General Aptitude

Q1:

The value of 0.1 x 0.1 x 0.1 + 0.02 x 0.02 x 0.02 is:
0.2 x 0.2 x 0.2 + 0.04 x 0.04 x 0.04

A 0.0125

B 0.125

C 0.25

D 0.5

ANS:B - 0.125

Given expression = (0.1)3 + (0.02)3 = 1 = 0.125
23 [(0.1)3 + (0.02)3] 8