The wall and ceiling of a room to be plastered. The length, breath and height are 4.5cm, 3 cm and 4 cm respectively. Find the cost of plastering the wall and ceiling at the rate of Rs.8 per sq.m.
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area of room =2(lb+bh+hl)
- =2(4.5*3+3*4+4*4.5)
- =2(13.5+12+18)
- =2(43.5)
- =87.0cm^2
at the rate of 8 RS =87*8
- =696 RS
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