At his current level of consumption, Cameron gets 3 times more marginal utility from an additional game of pinball than from an additional game of ping pong. If the price of a ping pong game is $0.50, then he is maximizing utility if the price of a pinball game is:

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?