Mr. D'Alton made some radium in his lab. He used 2 kg of the radium every time he ran his experiment. If he did the experiment four times and had 24 kg left, how much
radium did Mr. D'Alton make at first?​

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?