Verified by Ajay Kumar
An amount doubles in 7 years under compound interest. How many years will it take for the amount to grow to 16 times its original value?
21 years
28 years
35 years
42 years
Answer: B
The amount doubles every 7 years. Since \(16=2^4\), the amount must double 4 times. Time = \(4\times7=28\) years. Trick: Express the required multiple as a power of 2.
चक्रवृद्धि ब्याज के तहत एक राशि 7 वर्षों में दोगुनी हो जाती है। इस राशि को अपने मूल मूल्य से 16 गुना होने में कितने वर्ष लगेंगे?
21 साल
28 साल
35 साल
42 साल
उत्तर: B
राशि प्रत्येक 7 वर्ष में दोगुनी होती है। चूँकि \(16=2^4\), इसलिए राशि को 4 बार दोगुना होना होगा। समय = \(4\times7=28\) वर्ष। ट्रिक: आवश्यक गुणक को 2 की घात के रूप में लिखें।
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