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Solution - Sum of First n Terms of an AP

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Question

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 than for the preceding day. How much money the contractor has to pay as penalty, if he has delayed the work by 30 days.

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Reference Material

Solution for concept: Sum of First n Terms of an AP. For the course 8th-10th CBSE
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