Answer
The Sun has completed $~~26~~$ revolutions.
Work Step by Step
In part (a), we found that it takes $~~1.7\times 10^8~years~~$ for the Sun to make one revolution.
We can find the number of revolutions the Sun has completed:
$\frac{4.5\times 10^9~years}{1.7\times 10^8~years} = 26$
The Sun has completed $~~26~~$ revolutions.
