Using only the data from $2013$ to $2019,$ calculate the following using the high$-$low method $($carry out calculations to $6$ or $7$ decimals$)$: $($a$)$ the variable operating expense per RPM$,($b$)$ the fixed operating expense per year, and $($c$)$ the total operating expense per RPM for the $$high activity$$ year in your high$-$low calculation. Compare the total variable expense for the $$high activity$$ year to the fixed expense. Which is larger?