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A contract on construction job specifies...

A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows: Rs 200 for the first day, Rs 250 for the second day Rs 300 for the third day, etc., the penalty for each succeeding day being Rs 50 more

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The A.P. formed is 200, 250, 300, ...
Here a=200, d=50 and n=30
`:. S_(30)=(30)/(2)[2(200)+(30-1)xx50]`
`=15(400+1450)=15xx1850=27,750`
`:. ` Penalty paid by contractor in 30 days = Rs. 27,750.
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