please show how to solve this step by step

You are bearish on Telecom stock and decide to sell short 100 shares at the current market price of $30 per share. Assume that you put into your brokerage account 50% of the value of the short position. If you earn no interest on the funds in your margin account. what will be your rate of return after 1 year if Telecom stock is selling at $207 Assume that Telecom stock has paid a year-end dividend of $1 per share. The price of $20 should be interpreted as ex-dividend, that is, prices after the dividend has been paid. 60%73.3%66.67%55.3%