what is the nominal annual rate?

Question

A sum of $750 is invested for 15 years and the interest is compounded quarterly. There is 1200 in the account at the end of  15 years.What is the nominal annual rate?

Round your answer to three decimal places.

Answer 1

750*(1.int/4)=1x; 1x*(1.int/4)=2x; 2x*(1.int/4)=3x; 3x*(1.int/4)=1yr.

I opened a program and used interest .0135=1.35%.

The formula is: fv=p*(1+int/c)^(n*t). future value; principal, interest, compound, yrs, time/yr.

750*(1+.0135/4)^(4*15)=$1500.13