[填空题]
At the beginning of each year, Jacxbj -,m jao0e g:vl 09j//jsjukw*qgkg:7slz p2y((e a invests 5000 in a savings account that pays 4% annual interest, compounded qua: ge7p((qly*zs gkwa 2rterly
1.Find the number of years it will take until Jack has 100000 in his account.
Hence it will take years until Jack has 100000 in his account.
At the beginning of each year, John invests 6000 in a savings account that pays an annual interest rate, compounded semi-annually. After 20 years John has 200000 in his account.
2.Find the annual interest rate.
Hence the annual interest rate is %
