this is english math!

题目

this is english math!
1.suppose you invest $1000 for five years at 6% simple interest.How does the simple interest compare to the compound interest?
2.find the amount of money in a savings account if $1000 is invested for five years at 6% interest compounded quarterly.
3.suppose you leave $100 in each of three bank accounts paying 5% interest per year.one account pays simple interest,one pays interest compounded semiannually ,and one pays interest compounded quarterly.find the amount of money in each account after three years

答案

It's a easy question,but hard to answer.
1 simple interest:1000*6%*5
compound interest:1000*(1+6%)*E5 (compound interest yearly)
2 1000*(1+6%/4)*E60
3 simple interest:100*5%*3
compound interest semiannually:100*(1+5%/2)*E6
compound interest semiannually:100*(1+5%/4)*E12