Volume and body diagonal

Calculate how much the volume and body diagonal of the cuboid decrease if we reduce each of its three edges a, b, c by 18%?

Correct result:

p1 =  44.8632 %
p2 =  18 %

Solution:

p=18 % q=1−p/100=1−18/100=4150=0.82 p1=100⋅ (1−q3)=100⋅ (1−0.823)=44.8632%
p2=p=18=18%

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