A rectangular lawn 55 m by 35 m has two roads each 4 m wide running in the middle of it , one parallel to length and the other parallel o breadth . The cost of gravelling the roads at 75 paise per sq. metres is
Area of cross roads = ( 55 x 4 + 35 x 4 - 4 x 4 ) `m^2` = 344 `m^2`
`:.` Cost of gravelling = `Rs. (344 xx 75/100)` = Rs. 258.
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