5). How many months will it take at 6% simple interest for $2000 to grow to $2400?

Can I have help solving these problems for basic finance. They are simple and compound interest problems. Thank you!!! If it is easier you can explain it on excel!

5). How many months will it take at 6% simple interest for $2000 to grow to $2400? 5). Find the amount of interest for $3000 in an account paying simple interest of 5% for 2 years. 7). Find the amount of interest for $3000 in an account paying 5% interest compoundedannually for 2 years. (Comment on this solution compared with your answer for question #6.} 8). Find i, the rate of interest per period, if $5000 is compounded monthly at 3% annual rate(APR). (Write your answer as a 96}