Question

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Answer 1

Let x be the length
Volume= l x w x h

If x is to be increased by 60% then u gotta multiply it by 160% (if you don’t understand this step tell me)

1.6x • 1.6x • 1.6x = 4.096 x^3
The volume would then be increased by 409.6%

Answer 2

v = s³
v = (1.2s)³
v = 1.728s³

1.728 * 100% = 172.8% increase