A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

Answers (1)

Length of the tank (L) = 25m

width of the tank (W) = 12m

Height of the tank (H) = 6m

Surface area of the 4 walls = 2(LXH + WxH)

                                           = 2x6(25+12)

                                          = 12x27

                                          = 324 square meter

Surface area of the bottom = LXW

                                           = 25x12 = 300 square meter 

Total area for plastering = 324+300 = 624 squre meter

Cost of the plastering =  75 pasie/square meter

Total cost of plastering = 624x75 = 46800 paise = Rs 468.

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