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A swimming pools is 20\ m in length, ...

A swimming pools is `20\ m` in length, `15\ m\ ` in breadth, and `4\ m` in depth. Find the cost of cementing its floor and walls at the rate of `R s .12\ p e r\ s q u a r e\ m e t r edot`

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length `l=20m`
`b=15m`
`h=4m`
total area of wall and floor `=lb+2(bh+hl)`
`=20xx15+2(15xx4+4xx20)`
`=580m^2`
the cost of cementing its floor and walls `=580xx12=6960 rupees`
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