A sum of money doubles itself in 5 years at simple interest. What is the rate of interest per annum? साधारण ब्याज पर कोई राशि 5 वर्षों में दोगुनी हो जाती है। प्रति वर्ष ब्याज दर क्या है?
A
10% (10%)
B
15% (15%)
C
20% (20%)
D
25% (25%)
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Correct Answer 20%
Explanation
Let Principal = P. Amount = 2P. SI = P. Rate = (SI * 100) / (P * T) = (P * 100) / (P * 5) = 20%.