Total cost of the gift : Y dollors

Total number of students : R

Hence, per head contribution : Y / R

Now, x students refuse to pay.

Hence, the amount that had to be payed by X students : X * per head contribution : X*(Y/ R)

Number of students remaining : R - X

Hence, additional per head contribution : amount that had to be payed by X students / remaining students:

XY/R(R-X)

ANS : D

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