A person paid rs 6200 compound interet on a certian sum of money that he borrowed from a bank at 10% p. a. compounded anually for 1.5 years. find the compounded intrest on the same sum and at the same rate for the same period of time, if the interest had had to be paid semi- annually.​

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So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

Iimagine the answer is b.