The Price King Auto Mall pays their sales staff by commission of the dealership profit the dealership makes on each sold car. If the profit is $600 or less, the commission rate is 18%. If
the profit is greater than $600 and less than or equal to $1,100, the commission rate is 20% of
the profit. If the profit is higher than $1,100, the rate is 25%. If x represents the profit, express
the commission c(x) as a piecewise function.