Show work in excel please!

You have entered a short position in an oil futures contract. The contract size is 1,000 barrels for each contract. The initial margin required is $20,000 per contract. The maintenance margin is $17,000. The contract is entered at market close on February 10 at a price of $64/ barrel. The oil futures price is $63/ barrel on February 11,$60/ barrel on February 12 , and $68/ barrel on February 13 . What is the net gain/loss on your position at end of day February 13? (Insert your final answer as a full dollar amount i.e. $600. Be sure to include any margin calls in your overall net gain/loss. Negative answers should be notated with a negative () sign.)