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Question

Pranava frequently uses his debit card for online shopping. In a month, he had an initial amount of Rs. 9,800 in a bank. He credited Rs. 11,000 to his account on 07122011. He used his card for online shopping and an amount of Rs. 6,125 was debited from his account on the same day. He credited Rs. 3,400 on 19122011 by cheque no. 787865.HewithdrewRs. \ 4,800forselfvidechequeno.123432on24-12-2011andagainwithdrewRs.\ 750videchequeno.565677.EntertheseparticularsintoSBaccountandfindinterestat4\%$ per annum on daily product basis.

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Solution

DateParticulars Cheque no. Debit Credit Balance
01-12-2011Balance B/F 9800.00
07-12-2011 By cash
11000.00 20800.00
07-12-2011 To self 6125.00 14675.00
19-12-2011By cheque 787865
3400.00 18075.00
24-12-2011 By cheque 123432,565677 5550.00 12525.00

To calculate the interest on daily product basis, we have to consider the balance at the end of each day and find interest for those days. We can do this by calculating the daily product for the month and finding the interest at the given rate for one day. We do this as follows:
Rs. 9800 for 6 days: 9800×6= Rs. 58,800(because there was Rs. 9800 from 1st to 7th)
Rs. 14675 for 12 days: 14675×12= Rs. 176,100
Rs. 18075 for 5 days: 18075×5= Rs. 90,375
Rs. 12525 for 8 days: 12525×8= Rs. 100,200
Adding these we get the product for the month. Thus product for the month = Rs. 425,475 and T =1 day =1/365 years.
Interest for the month =425,475×4100×365=46.62
Therefore the interest for the month is Rs. 47.

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