Answers

2016-04-13T15:08:38+05:30
Surface area = 2(lb+bh+hl)
                       = 2(270 + 36 + 120 )
                       = 852 sq.m
area of top surface = 30*9 = 270
area of plastering = 852 - 270
                               = 582
cost of plastering = 25 * 582 = 14550 paise = Rs 145
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2016-04-13T15:27:00+05:30
Let us find the lateral surface area of tank(cuboid)
here, l = 30 m, b = 9m , h = 4 m
2h( l + b) = 2(4) ( 30 + 9)
               = 8(39)
               =312 m²
area of the base (rectangle) = l × b
                                             = 30 ×9
                                             = 270m²
area of walls and bottom = 312 + 270 = 582 m²
cost of plastering 582 m² = 582× 25
                                         = 14550 paise
                                         =  rs.145.50 ( nearly rs. 145)
therefore, the answer is fourth one.

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