To find out how much Isabelle will pay each month for the mountain bike, you can divide the total cost of the bike by the number of months she will be paying.
Total cost of the bike: $1,149.79
Number of months: 6
Now, divide the total cost by the number of months:
\[ \frac{1149.79}{6} \approx 191.63 \]
Rounding this amount, she will pay approximately $192 each month.
Since the options provided do not include $192, let's look at the closest standard payment options:
- $100
- $200
- $250
- $300
The closest option to $192 is $200.
Thus, the most reasonable choice from the options given is $200.