How Many Revolutions Does a CD Make When Stopping?

[Paymemoney]

Homework Statement

How many complete revolutions does the CD make as it spins to a stop?

The Attempt at a Solution

I already know that the Angular displacement is 68.1 rad

The answer is $$\frac{68.1}{2\pi}$$ = 107 revolutions

however this is incorrect according to the book's answer's

P.S

 

[nnnm4]

Check your division.

 

[Paymemoney]

it gives me 10.83,i round it up to 11 and it is still incorrect.

by the way the answer should be integer.