3.24 divided by 7.2 boi like hdhdjjdjejdd

Can someone me and plz do the problem

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?