Olsen Corporation manufactures skis. Data for the past four months related to the cost of maintenance on its machinery is given below: Month Machine Hours Maintenance Cost April 21,000 $26,020 May 18,500 $24,600 June 15,000 $22,300 July 19,000 $25,100 25. Using the high-low method of analysis, what is the fixed cost of maintenance on the machinery?

a. $14,500.

b. $5,020.

c. $13,000.

d. $12,320.