find the cost of painting 3 iron boxes at the rate of rs5 per square metre whose dimension are 1.5m × 0.85m × 0.20m, 2m × 0.65m × 0.35m and 2m × 0.90m × 0.45m????????? answer======rs 70.78
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area of the iron box=2(1.5×0.85+0.85×0.20+0.20×1.5)
total surface area of 2nd box
and then find the total surface area of third box
add them and multiply with 5
total surface area of 2nd box
and then find the total surface area of third box
add them and multiply with 5
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