I got the wrong answer. Please solve it all problems clearly and explain all the steps to understand it.

Oliver deposits $200 at the beginning of every 3 months into a bank account for 10 years. The annual effective rate of discount (not interest) is 9%. d = 9% Calculate the effective interest rate for 3 months. Less than 2.1% 2 incorrect answer, this is what I chose 2.1% or higher but less than 2.2% 2.2% or higher but less than 2.3% 2.3% or higher but less than 2.4% 2.4% or higher but less than 2.5% 2.5% or higher Question 2 (Continued from the last question.) Calculate the accumulated value at the end of 10th year. O less than $12,800 $12,800 or more but less than $13,000 $13,000 or more but less than $13,200 $13.200 or more but less than $13.400 $13,400 or more but less than $13,600 $13.600 or more - incorrect, this is what I chose