I need help pls. theres only a few answer choices

After two years, how much has been paid into interest?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals