Variable costing OBJ. 1 Light Company has the following information for January:

Sales $648,000 Variable cost of goods sold 233,200 Fixed manufacturing costs 155,500 Variable selling and administrative expenses 51,800 Fixed selling and administrative expenses 36,800 Determine

(a) the manufacturing margin,

(b) the contribution margin, and

(c) income from operations for Light Company for the month of January.