Suppose you were in a short position for one crude oil futures contract with a maturity date on 20/02/2018. Each contract unit is 1,000 barrels of crude oil. The current oil price is $52.50 per barrel. The initial margin for one contract is $2,800. The maintenance margin for one contract is $2,250. If a margin call is received, the margin balance needs to boosted to the level of the initial margin. The oil prices are 51.8, 51.5, 52.8, 53.2 from day 1 to day 4. Which trading day will you get a margin call? What is the least amount of money you need to put to your margin account in order to keep your position? (use a comma to separate answers, only show the figure for the second question, no equation is required)