Question:
A sum of money doubles itself in 8 years at simple interest. In how many years will it become 5 times?
एक राशि साधारण ब्याज पर 8 साल में दोगुनी हो जाती है। कितने सालों में 5 गुनी हो जाएगी?
Options:
- a) 28
- b) 30
- c) 32
- d) 36
- a) 28 साल
- b) 30 साल
- c) 32 साल
- d) 36 साल
correct answer : c)
Explanation:
P doubles in 8 years → R = 100/8 = 12.5%. For 5 times: P + SI = 5P → SI = 4P. Time = (4P*100)/(P*12.5) = 32 years.
R = 100/8 = 12.5%। 5 गुना के लिए: T = 4×100/12.5 = 32 साल।