You are short 15 gasoline futures contracts, established at an initial settle price of $2.56 per gallon, where each contract represents 42,000 gallons. Over the subsequent four trading days, gasoline settles at $2.51,$2.54,$2.57, and $2.61, respectively. a. Calculate the profit or loss for each trading day. (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to the nearest whole number, e.g., 32.) b. Compute your total profit or loss at the end of the trading period. (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answer to the nearest whole number, e.g., 32.)