Joanna has $100 saved in a secret box in her room. Every month, she adds $10 to it. Mary also has $100, in the bank earning 1% interest per month.
Given an unlimited amount of time, who will have more money?
After 18 months, who will have more money?

Question

Joanna has $100 saved in a secret box in her room. Every month, she adds $10 to it. Mary also has $100, in the bank earning 1% interest per month.
Given an unlimited amount of time, who will have more money?
After 18 months, who will have more money?

anonymous · Answer

Joanna will have more money.

anonymous · Answer

what about after 18 months how much?

anonymous · Answer

18 * 10 = 180. 180 +100 = 280.

To solve for mary, there is a formula you can look it up on the internet