School districts face a back-to-school math problem: The high price of diesel

As the new school year kicks off, school districts are facing a challenging math problem: the high cost of diesel.
The price of a gallon of diesel is up nearly $2 compared with this time last year. That is meaningful for schools, considering that around 90% of the United States’ 480,000 school buses run on diesel.
Nationally, the average price was $5.62 for a gallon as of Wednesday, according to AAA. This time last year, it cost $3.70.
Read more from NPR.
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