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A college has raised $75\%$ of the amount it needs for a new building by receiving an average donation of Rs. $600$ from the people already solicited. The people already solicited represent $60\%$ of the people the college will ask for donations. If the college is to raise exactly the amount needed for the new building, what should be the average donation from the remaining people to be solicited?

- Rs $300$
- Rs $250$
- Rs $400$
- Rs $500$