On a given Wednesday morning, a short term trader in New York goes short on Canadian $ futures (size C$100,000 per contract) at US $0.8000 per Canadian S. The initial margin is US $ 2,500 and the maintenance margin is $1500. The closing futures price on Wednesday is US $0.8400 per CS, on Thursday close is US $0.8300 per CS, and on Friday close US $0.8340 per CS. The trader unwinds her position on Friday end. Find the ending account balance on Friday end, including margin account (additions and subtractions). a. $2,600 b. $1,100 O c $2,100 d. $3,100