kamilshahid wrote:

I think the best way to approach this question would be to backsolve. I picked D, then backsolved. That didnt work, so i checked B. B came out to be negative. Thus, the answer would be C.

Yes, back solving should help us and I did in that way only. But there is no need to pick any answer and in fact that wastes time.

My back solving is like this:

third day night: input & output are 1000,0

third day morning: input & output are 500, 1000

second day night: input & output are 1500,500

second day morning: input & output are 750, 1500

first day night: input & output are 1750,750

first day morning: input & output are 875, 1750

Now we know the answer!

But after seeing the first reply, I liked it very much and suggest to follow it because it is very methodical and probability of error is less.

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-Aravind Chembeti