George Kyparisis (using data from Problem 1.6) determines his costs to be as follows:
- Labor: $ 10 per hour
- Resin: $ 5 per pound
- Capital expense: 1% per month of investment
- Energy: $. 50 per BTU
Show the percent change in productivity for one month last year versus one month this year, on a multifactor basis with dollars as the common denominator.