Reduce of the volume

Calculate how many % reduce the volume of the cube is we reduced length of each edge by 10%.

Correct result:

p =  27.1 %

Solution:

p=100⋅V1−V2V1=100⋅a3−(0.9a)3a3 p=100⋅1−0.931=27.1%p = 100 \cdot \dfrac{V_1 - V_2}{V_1} = 100 \cdot \dfrac{ a^3 - (0.9a)^3}{a^3} \ \\ p = 100 \cdot \dfrac{ 1 - 0.9^3}{1} = 27.1 \%

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