Kamala lent a sum of ₹ 7,500 in the beginning of a year at a certain rate of interest. After 8 months, she again lent a sum of ₹ 3,600 but at a rate of interest that was twice the earlier one. At the end of the year, she earned ₹ 400 from both the loans. The original rate of interest was_________ % per year .
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