George Kypparisis $($using data from Problem $1\mathrm{.}5)$ determines his costs to be as follows: Labor: $$10$ per hour, Resin: $$5$ per pound, Captial expense: $1\%$ per month of investment, Energy $$0\mathrm{.}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.