Verified by Ajay Kumar
A sum of money amounts to ₹6,720 in 4 years and to ₹7,680 in 6 years at a certain rate of simple interest. What is the annual rate of interest?
8%
9%
10%
12%
Answer: C
The difference between the amounts is \(7680-6720=960\)₹, which is the simple interest for 2 years. Annual interest \(=960/2=480\)₹. Principal \(=6720-(4\times480)=4800\)₹. Rate \(=\frac{480\times100}{4800}=10\%\). Trick: Subtract the amounts to find the interest for the difference in years.
एक धनराशि साधारण ब्याज की एक निश्चित दर पर 4 वर्षों में ₹6,720 और 6 वर्षों में ₹7,680 हो जाती है। वार्षिक ब्याज दर क्या है?
8%
9%
10%
12%
उत्तर: C
दोनों राशियों का अंतर \(7680-6720=960\)₹ है, जो 2 वर्षों का साधारण ब्याज है। वार्षिक ब्याज \(=960/2=480\)₹ है। मूलधन \(=6720-(4\times480)=4800\)₹ है। ब्याज दर \(=\frac{480\times100}{4800}=10\%\) है। ट्रिक: वर्षों के अंतर के लिए ब्याज निकालने हेतु दोनों राशियों को घटाएँ।
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