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SI on (2x+2000) at 30% for 2 years = (x+2100). Find x, then CI on x at 30% for 2 years.

1. ₹1985
2. ₹2100
3. ₹3105
4. ₹3300

Correct answer: ₹3105

Solution

SI=(2x+2000)×30/100×2=(2x+2000)×0.6=1.2x+1200. Set equal to x+2100: 0.2x=900→x=4500. CI=4500×[(1.3)²−1]=4500×0.69=3105.

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