Questions: Answers with how to use formulas would be greatly appreciated to assist my learning. Thank You!

1. Bank is offering savings account with promotional 2% interest compounded monthly. If deposit 15k right now, how much is in account in 18 years?

2. Another bank... if you commit to deposit $100 a month for 18 years, then you are guaranteed a 3.5% interest rate compounded monthly. How much have at end of 18 years in the account? Is this a better option than first account?