a$.$ Refer to the table below and locate the E$-$Mini contract on the Standard & Poor's $500$ Index. If the margin requirement is $10\%$ of the futures price times the multiplier of $$50,$ how much must you deposit with your broker to buy one December contract?

Note: Round your answer to $2$ decimal places.

Required marginRequired margin

b$.$ If the December futures price increases to $3,800,$ what percentage return will you earn on your investment? Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

Percentage return

Percentage return

c$.$ If the December futures price falls by $1\%,$ what is the percentage gain or loss on your investment?

Note: Input the amount as a positive value. Use the dropdown to indicate whether there is a gain or loss. Do not round intermediate calculations. Round your answer to a whole number.

of $$