The manufacturing cost of Calico Industries for three months of the year are provided below:Total Cost Production (units)April $120,000 280,000May 74,000 165,000June 90,900 230,000Using the high-low method, the variable cost per unit and the total fixed costs area. $0.40 per unit and $8,000b. $4.00 per unit and $800c. $0.78 per unit and $4,000d. $7.80 per unit and $4,000