how do i get these numbers

Margin Transactions Suppose you bought 200 shares of a $50 stock and borrowed the maximum amount of money given an initial margin requirement of 50%. If the stock price increase to $60 per share, what will be your equity position in the stock? Total stock value: $12,000 Less amount borrowed: $5,000 Equity amount: $7,000 Equity position (%): $7,000/$12,000 = 58%