8. Adams Snow Removal cost formula for its vehicle operating cost is $1,900 per month plus $430 per snow-day. For the month of December, the company planned for activity of 16 snow-days, but the actual level of activity was 21 snow-days. The actual vehicle operating cost for the month was $11,470. The vehicle operating cost in the planning budget for December would be closest to

a. $10,930

b. $8,739

c. $11,470

d. $8,780