If an investment grows 50% in 4 years, what rate of interest j4 is being earned?

At what rate j365 will an investment of $4000 grow to $5000 in 3 years?

How long will it take for $800 to grow to $1500 in a fund earning interest at rate 9.8% compounded semiannually?

What sum of money, due at the end of 5 years, is equivalent to $1800 due at the end of 12 years if money is worth j2 = 11 3/4%?

One thousand dollars is due at the end of 2 years and $1500 at the end of 4 years. If money is worth j4 = 8%, calculate an equivalent single amount at the end of 3 years.

A debt of $2000 is due at the end of 8 years. If $1000 is paid at the end of 3 years, what single payment at the end of 7 years would liquidate the debt if money is worth j2 = 7%?