Hi tutors, I have difficulties solving problem c), can you give me detailed explanations?

Joshua sells short 3,200 shares of Wild Ride Ltd. when it is trading at $26.00. The margin requirement for Wild Ride is 30% and Joshua contributes the minimum necessary to his account. The shares drop to $11.00 and Joshua covers his short. a. How much did Joshua's account increase in value by, before interest and commissions? (2 marks) 48000 ' b. Assume Joshua did not cover his short and Mid Ride began trading upwards. The shares climb all the way up to $28.60 with Joshua contributing the required minimum margin each day. How much margin will now be in his account? (3 marks) {27456 7'; 35776 c. Assume Joshua covers his short at $28.60. What percentage of his angina] contribution did Joshua lose on this trade? Round your answer to two decimal places. (2 marks) ' 50.00