यदि प्रतिरुपैयाँ प्रति 4 महिनाको व्याज 5 पैसा भए प्रतिशत प्रतिवर्षको व्याजदर कति होला? If the interest at the end of each 4 months is 5 Paisa, then what would be the interest per annum?

Option D

For 4 months is Rs 0.05 For 12 months = Rs 0.05 x 3 = Rs 0.15 Hence interest per annum = 15 %