A rectangular solid is dilated by a factor of 0.5. How many times larger is the volume of the resulting solid than the volume of the original solid?

Volume of a rectangular solid is $V = a b c$ where, $a , b , c$ are length,breadth and height respectively.
So,$\frac{\delta V}{V} = \frac{\delta a}{a} + \frac{\delta b}{b} + \frac{\delta c}{c}$
Given, $\frac{\delta a}{a} = \frac{\delta b}{b} = \frac{\delta c}{c} = 0.5$
So,$\frac{\delta V}{V} = 0.5 + 0.5 + 0.5 = 0.15$