What annual interest rate r would allow you to double your initial deposit in 6 years if interest is compounded quarterly? Continuously? If you receive 6% interest compounded monthly, about how many...

What annual interest rate r would allow you to double your initial deposit in 6 years if interest is compounded quarterly? Continuously?

If you receive 6% interest compounded monthly, about how many years will it take for a deposit at time-0 to triple?