$1\mathrm{.}9$ David Upton is president of Upton Manufacturing, a producer of Go$-$Kart tires. Upton makes $1,00$ tires per day with the following resources:

$\backslash$table$[[$Labour:$,400$ hours per day @$$12\mathrm{.}50$ per hour$],[$Raw material:,$20,000$ pounds per day @$$1$ per pound$],[$Energy:$,$$$5,000$ per day$],[$Capital costs:,$$10,000$ per day$]]$

a$.$ What is the labour productivity per labour$-$hour for these tires at Upton Manufacturing?