I need help please and thank you

Can someone answer these problems for me

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?