A picnic was arranged by m students. Total cost of the picnic was estimated to be y taka. Unfortunately, z students withdrew their names from the picnic. How many more taka would each of the remaining students have to pay?
A. \(\frac{y}{m}\)
B. \(\frac{y}{m-z}\)
C. \(\frac{y}{m-z}-\frac{y}{m}\)
D. \(\frac{y}{m}-\frac{y}{z}\)
E. cannot be determined
Explanation: প্রথমে, per student cost \(= \frac{y}{m}\). পরে, remaining students \(= m-z\), per student cost \(= \frac{y}{m-z}\). \(\therefore\) Excess payment \(= \frac{y}{m-z}-\frac{y}{m}\).
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