What is the nominal annual interest rate expressed as a percentage rate?, assignment help

1. use an effective annual rate of 6.5 % rather than the effective annual rate given in your textbook: 

What is the nominal annual interest rate expressed as a percentage rate?

2. use a nominal annual interest rate of 5.1 % rather than the nominal annual rate given in your textbook: 

What is the effective annual rate under continuous compounding of that nominal interest rate?

3. use a 5.2 % interest rate compounded continuously. 

(a) What is the effective annual rate? % 

(b) How long does it take the balance to double? 

years (Here you may use a fractional number of years.) 

(c) Find the formula for the doubling time t in years, in terms of the interest rate r: 

t=