David Upton is president of Upton Manufacturing, a producer of Go$-$Kart tires. Upton makes $1,200$ tires per day with the following resources.

Labour:

Raw Material:

Energy:

Capital:

$425$ hours per day @ $$12\mathrm{.}00$ per hour

$20,000$ pounds per day @$$1\mathrm{.}00$ per pound

$$5,250$ per day

$$10,250$ per day

a$)$ Labour productivity per labour hour for these tires $=$ tires$/$labour hour. $($Round your response to two decimal places.$)$

b$)$ Multifactor productivity for these tires $=$ tires$/$dollar$.($Round your response to four decimal places.$)$

c$)$ The percent change in multifactor productivity if Upton can reduce the energy bill by $$950$ per day without cutting production or changing any other inputs $=,\%.($Enter your response as a percentage rounded to two decimal places.$)$

Note: Calculate the new multifactor productivity to four decimal places before calculating the percentage change.