Afraction number: the sum of the numerator and denominator is 40. if its value is 3/5 after simplifying, what is the fraction before simplifying? (generate variable and answer in equation)

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?