Travis deposited $100 into a savings account that earns 6% compounded monthly. He plans on keeping the money in the account for 6 months and depositing an additional $100 each month. at the end of 6 months, how much interest will Travis have earned?
There is a formula for calculating this problem, but you can solve it without; take 6% and add it back to the total along with the $100 deposited each month.
