Question:
A sum of money doubles itself in 8 years at simple interest. What is the rate of interest per annum?
(a) 10%
(b) 12%
(c) 12.5%
(d) 15%
(e) 11.25%
कोई धनराशि साधारण ब्याज पर 8 वर्षों में दोगुनी हो जाती है। प्रति वर्ष ब्याज दर क्या है?
(a) 10%
(b) 12%
(c) 12.5%
(d) 15%
(e) 11.25%
Correct Answer: (c)
Explanation:
Let principal = P. Amount = 2P => Simple Interest SI = P.
SI = (P R T) / 100 => P = (P R 8) / 100 => R = 100 / 8 = 12.5% per annum.
SI = P। P = (P R 8) / 100 => R = 100 / 8 = 12.5% प्रति वर्ष। सही उत्तर (c) है।