The manager of a company determines that when $\displaystyle {q}$ hundred units of a particular commodity are produced, the total cost of production is $\displaystyle {C}$ thousand dollars, where:

$\displaystyle {C}^{{2}}+{6}{q}^{{2}}={6444}$

The total cost changes by  dollars per week, rounded to the nearest cent, when $\displaystyle {1700}$ units are being produced and the level of production is decreasing at the rate of $\displaystyle {87}$ units per week.