You are considering different investment strategies to save for your retirement. Here are the options, and there are questions to answer :
Option 1: you invest $25/month at a rate of 3.25% APR compounded monthly for 30 years.
Option 2: you invest $75/quarter at a rate of 4.00% APR compounded monthly for 30 years.
Option 3: you invest $1,000 at a rate of 6.25% APR compounded monthly for 30 years.

Question 1: Which option was the least amount invested and what was the investment plan?
Question 2: Which option yielded the highest amount at the end of the 30 years, and what was the basis of the question?
Question 3: What is the difference in the principal invested for the highest and lowest final balances? What is the difference in the interest earned?
Question 4: Is it better to invest more money in the beginning of the end of the 30 years?