The standard compound interest formula is
Future value after x years with an annual interest of i
=Present Value (1+i)^x [which is an exponential function]
for given present value of $360. interest=0.03 (3%) and a total of x years, above equation reduces to
Future value after x years
=360(1.03^x)

As, 

=0.301029+0.845098+1.13943
=2.26007
=2.260(approximate)
The rate is 16 dollars for 9 books and the unit rate is $1.777777778 per book.
Answer:
6x^3y^2z sqrt.6xyz
Step-by-step explanation: