part A is correct but I do not understand how to get part B. Can someone show me step by step please.

You are bearish on Telecom and decide to sell short 100 shares at the current market price of $30 per share. a. How much in cash or securities must you put into your brokerage account if the broker's initial margin requirement is 50% of the value o the short position? s 1500 Initial margin b. How high can the price of the stock go before you get a margin call if the maintenance margin is 30% of the value of the short position? (Round your answer to 2 decimal places.) Stock price reaches