At the end of 2018, Diatomic Company implemented a new labor process and redesigned its product with the expectation that input usage efficiency would increase. Now, at the end of 2019, the president of the company wants an assessment of the changes on the company's productivity. The data needed for the assessment are as follows: Output Output prices Materials (lbs.) Materials unit price Labor (hrs.) Labor rate per hour Power (kWh) Price per kwh 2018 45,000 $10.00 22,500 $3.00 18,000 $5.00 11,250 $2.00 By how much did profit change as a result of profitability changes in labor? 2019 54,000 $10.00 22,950 $4.00 16,875 $5.00 14,625 $3.00