If Konrade's Engine Company purchases 1,000 TE456 parts from the outside supplier per month, how will its monthly operating income change? A. Decrease by $7,000 B. Increase by $5,000 C. Increase by $7,000 D. Decrease by $5,000 If Konrade's Engine Company purchases 1,000 TE456 parts from the outside supplier per month, how will its monthly operating income change? A. Decrease by $7,000 B. Increase by $5,000 C. Increase by $7,000 D. Decrease by $5,000