8. DecryptCo has $50,000 to invest in a bank account. How long will it take (years) the amount in a bank account to double itself under the following circumstances? (a) (b) (c) 4% nominal annual, compounded quarterly interest rate? (2 marks) 3.85% nominal annual, compounded monthly interest rate? (2 marks) 4.2% nominal annual, compounded semi-annually interest rate? (2 marks) (d) 3.8% nominal annual, compounded continuously? (2 marks)