Answer: 24.5% of the vehicles are buses
Explanation: We know that 400 vehicles passed the intersection, so 400 vehicles are the 100% in this scenario.
Now, 98 of those vehicles are busses, and this is associated with an X%
Then, the ratios between the numbers and the associated percents must be equal, this means that:
X%/100% = 98/400
x% = (98/400)*100% = 24.5%
So 24.5% of the vehicles are buses