If you initially invest 2,000 in a bank account that offers a compound interest rate of a 6%, how much money will you have after 10 years?

How much should you invest today in a bank account that offers an interest rate of 8%, in order to finally have 5,000 (FV) in 5 years?

If you initially invest 5,000 in a bank account that offer an interest rate of 5%, for how long you should keep that money there in order to finally have 6,000?

If you initially invest 5,000 in a bank account, what is the interest rate that bank should offer in order to finally have 8,000 after 4 years?

What is the best option: to receive 10,000 now, to receive 15,000 in two years or to receive 20,000 in five years. The interest rate is a 20%