A sum of money doubles itself in 8 years at simple interest. What is the rate of interest per annum? कोई राशि साधारण ब्याज पर 8 वर्षों में दोगुनी हो जाती है। प्रति वर्ष ब्याज की दर क्या है?
A
10% (10%)
B
12% (12%)
C
12.5% (12.5%)
D
15% (15%)
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Correct Answer 12.5%
Explanation
If Principle (P) doubles, Interest (I) = P. Using I = PRT/100: P = (P * R * 8) / 100 => 100 = 8R => R = 12.5%.