Mr. D'Alton made some radium in his lab. He used 2/5kg of the radium every time he ran his experiment. If he did the experiment four times and had 2 1/3 kg left, how much radium did Mr. D'Alton make at first?​

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.