The Miramichi Company uses the high$-$low method to estimate its cost function. The information for the current year is provided below:

$$ Machine$-$hours Costs

Highest observation of cost driver $2,000$ $$225,000$

Lowest observation of cost driver $1,000$ $$125,000$

What is the slope coefficient per machine$-$hour?

Question $7$Select one:

a$.$

$$12\mathrm{.}50$

b$.$

$$125\mathrm{.}00$

c$.$

$$100\mathrm{.}00$

d$.$

$$0\mathrm{.}50$

e$.$

$$10\mathrm{.}00$