R, S, Q and P are the midpoints of OC, CB, BA and OA respectively. OR = a, CS = b and OP=C
Show that RS is parallel to PQ

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?