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Get access to the detailed solutions to the previous years questions asked in IIFT exam
It is given,
cost(c) is directly proportional to square of weight (w2), i.e.
Cost when block is divided into four parts whose weights are in ratio 2:4:7:11
Let the weights be 2x, 4x, 7x, 11x
Cost = k ( ) = (4x2 + 16x2 + 49x2 + 121x2) = 190kx2
Cost when block is divided into four equal parts
Let the weights be 6x, 6x, 6x, 6x
Cost = k ( ) = (4 x 36x2) = 144kx2
It is given, 190kx2 - 144kx2 = 73600
kx2 = 1600
Actual weight of granite = 24x
Cost = 576kx2= 576 x 1600 = 921600
The answer is option C.