The delivery trucks of Moore's Building Supply incurred maintencace costs of $2,400 during its busiest month of 20xx, in which 8,000 miles were driven collectively. During its slowest month, $1,800 in maintenance costs were incurred, reslting from 5,000 miles being driven, Using the high-low method, what maintenance cost would the company expect to incur at 10,000 miles of driving?

a.$600

b.$2,800

c.$2,000

d.$1,600