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I have 25000$ and and I used a margin loan from my broker to doble the amount for investing 50000$

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I have 25000$ and and I used a margin loan from my broker to doble the amount for investing 50000$. I used that money to buy shares of Thornscape at 70$ per share. After 6 months he sells the share for 78$ per share. The broker charges 7% on the loan. What is my rate of return?