Steven began operating his own landscaping business as a teenager, learning about costs on day $1$: lawnmowers require gas and oil, and they also require maintenance! In time, he used his experience to adjust his rate of pay to $$\frac{15}{?}$ hour, to better cover his costs. He worked a total of $450$ hours this year in his busingss and recognized expenses of $$4,100.$

$($a$1)$ How much profit did Steve$$ earn this year?

Profit $

$($a$2)$ Would part of his expenses include COGS$/$cost of sales?

His expenses $$ include COGS.