# Q : 7       Shanti Sweets Stall was placing an order for making cardboard boxes for packing their sweets. Two sizes of boxes were required. The bigger of dimensions , and the smaller of dimensions . For all the overlaps, of the total surface area is required extra. If the cost of the cardboard is Rs 4 for ,  find the cost of cardboard required for supplying 250 boxes of each kind.

Given,

Dimensions of the bigger box = ,

Dimensions of smaller box =

We know,

Total surface area of a cuboid =

Total surface area of the bigger box =

Area of the overlap for the bigger box =

Similarly,

Total surface area of the smaller box =

Area of the overlap for the smaller box =

Since, 250 of each box is required,

Total area of carboard required =

Cost of  of the cardboard = Rs 4

Cost of  of the cardboard =

Therefore, the cost of the cardboard sheet required for 250 such boxes of each kind is

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