The Woody Company manufactures slippers and sell them at $10 a pair. Variable manufacturing cost 13 $4.50 a pair, and allocated fixed manufacturing cost is $1.50 a pair. It has enough idle capacity available to accept a one-time-only special order of 20,000 pairs of slippers at $6 a pair. Woody will not incur any marketing costs as a result of the special order. What would the effect on operating income be at the special order could be accepted without affecting normal sales? Increase by SZERO (Income stays the same. Increase by $60,000 Increase by $110,000 Increase by $30,000 Increase by $10,000