what three variables determine how much interest a person could earn from a savings account?

The three variables that determine how much interest a person could earn from a savings account are:

1. The amount of money deposited (principal).
2. The interest rate paid by the account.
3. The length of time the money remains in the account (time invested).

These variables influence the calculation of interest, whether simple or compound, and ultimately how much the savings will grow over time.