In the fourth quarter of last year, Colditz Company embarked on a major effort to improve productivity. It redesigned products, reengineered manufacturing processes, and offered productivity improvement courses. The effort was completed in the last quarter of the current year. The controller's office has gathered the following year-end data to assess the results of this effort: Units manufactured and sold Selling price of the product Direct materials used (pounds) Cost per pound of materials Direct labor hours Hourly wage rate Power (kwh) Cost of power per kwh Required Current Year 24,000 $ 59 15,900 $ 20 7,150 $ 35 2,000 Prior Year 18,000 $ 59 12,000 $ 16 7,900 $ 30 750 $ 2 $ 2 1. Prepare a summary contribution income statement for each of the 2 years, and calculate the change in operating income. 2. Compute the partial operational productivity ratios for each production factor in each year.