Steady increase in its per-unit Manufacturing 25) 179) Windex manufactures lights. During the past few months, they have experienced a costs even though their total manufacturing casts have remained stable. The increase per-unit manufacturing costs may be due to ? costs it the number of light fixtures produced by them during the past few months has been steadily a A) Fixed, decreasing (3) Fixed, increasing c) Variable, decreasing D) variable, increasing