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Oops. Sorry about that
Slipped out of my mind :p

thanks for correcting my mistake :)

correct answer is 250 * 8 / 0.8 = 2500

:)

Volume of coin = 3.142(pi or 22/7) * 0.8 * 0.4 = V1

Volume of cylinder = 3.142(pi or 22/7) * 10 * 8

No. of coins required = (10 * 8 * pi) / (0.8 * 0.4 * pi)

{pi and pi get cancelled}
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I'm not a good person in such matters.
But all I can say is that if you love her, and she feels the same for you, go on.

Forgive and forget.
If the problem persists, ask her if you are the real...