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Amount, Principal and Interest

Ravi borrowed...

Question

Ravi borrowed ₹2000 at 2% per annum and ₹1000 at 5% per annum. He cleared his debt after 2 years by giving ₹2800 and a watch.What is a cost price of the watch?

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Solution

Part 1:
Principal=₹2000, Time=2 yrs, Interest=2%
Amount=PRT=200022%=₹80
Total=₹2000+₹80=₹2080
Part 2:
Principal=₹1000, Time=2 yrs, Interest=5%
Amount=PRT=100025%=₹100
Total=₹1000+₹100=₹1010
Part 3:
Total to be returned=₹2080+₹1010=₹3090
Money returned=₹2800
Cost of watch =₹3090-₹2800=₹290

Therefore Cost Of Watch is ₹290.
3090 is written because he must return 2000 rupees+its intrest and 1000 rupees and its intrest
sum of them is 3090
it is explained above
please try to understand

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