Need Help please

The tires on your bicycle have a diameter of 22 inches.
How many rotations does each tire make when you travel 800 feet?
Round your answer to the nearest whole number.

Let p = perimeter circle
Let d = diameter circle
Let n = number of rotations

perimeter circle:
$\begin{array}{|rcll|} \hline p &=& d\cdot \pi \quad &| \quad d = 22\ in. \\ p &=& 22\cdot \pi \ in. \\ \hline \end{array}$

rotations:

$\begin{array}{|rcll|} \hline n &=& \dfrac{ 800\ feet \cdot \frac{12\ in.}{1\ feet}} {p} \quad &| \quad 1 feet = 12\ inches \\ n &=& \dfrac{800\cdot 12}{22\cdot \pi} \\ n &=& 138.898859426 \text{ rotations } \\ \hline \end{array}$

Round your answer to the nearest whole number: 139 rotations