George Kyparisis $($using data from Problem $1\mathrm{.}5)$ determines his costs to be as follows:

$$Labor: $$10$ per hour

$$Resin: $$5$ per pound

$$Capital 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