If for a certain amount and same interest rate the simple interest is Rs. 600 and compound interest is Rs. 612 of two years, then annual rate of interest is :यदि किसी धन का समान ब्याज दर पर 2 वर्ष का साधारण ब्याज 600 रुपये और चक्रवृद्धि ब्याज 612 रुपये है, तो ब्याज की वार्षिक दर है :

1. A3%
2. B6%
3. C4%
4. D8%

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Correct answer: C. 4%

Explanation

SI for 2 years = 600, so SI for one year = 300. CI − SI = 12 is the interest on the first year's interest: 300 × r/100 = 12, so r = 4%.2 वर्ष का SI = 600, अतः 1 वर्ष का ब्याज = 300। CI − SI = 12 पहले वर्ष के ब्याज पर ब्याज है: 300 × r/100 = 12, अतः r = 4%।