Explanation:

- The selling price (SP) is four times the cost price (CP).

- Therefore, SP = 4 * CP.

- If the SP is reduced by Rs 300, the profit becomes 250%.

- 250% profit implies the selling price is 3.5 times the cost price (since 100% CP + 250% of CP = 350%).

- New SP = CP + 2.5 * CP = 3.5 * CP.

Equating both the maxims:

- 4 * CP - 300 = 3.5 * CP

- Solve for CP:

- 4 * CP - 3.5 * CP = 300

- 0.5 * CP = 300

- CP = 300 / 0.5

- CP = 600

- Option 1: Rs 600 is correct.

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