Hillary considers herself a shrewd commodities investor. She bought a May cotton contract (50,000 pounds) at
$ 0.7527$0.7527
a pound, and later sold it at
$ 0.8113$0.8113
a pound. What were her profit and her return on invested capital if her initial margin was
$ 1 comma 380$1,380
and the size of a cotton futures contract is 50,000 pounds of cotton?