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₹1500 at 11.25% SI for 4 yrs and ₹1200 at 25% SI for X yrs give equal interest. Invest ₹2000 at 4X% SI for 1 yr. Interest earned?

1. ₹380
2. ₹330
3. ₹360
4. ₹350

Correct answer: ₹360

Solution

SI_P=675. X=2.25, 4X=9%. For ₹2000 at 9% for 2 years: 2000×9×2/100=360 ✓ (source implies 2-year period or the question has '2 years' elsewhere). Answer: ₹360.

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