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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 days as follows: Rs. 180 for the first day, Rs. 200 for the second day, etc., the penalty for each succeeding day being Rs. 20 more than the preceding day. (i) How much money the contractor has to pay as penalty, if he has delayed the work by 15 days? (ii) For how many days has the contractor delayed the work if he paid Rs. 7400 as penalty?

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The correct Answer is:
(i) Rs 4800 (ii) 20 days
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