A company manufactures @ 55-inch televisions which sell for $r and 60-inch televisions which sell for $s. The weekly demand and cost equations are as follows: r=-2x+y+378 s =3x -9y + 385 C(x, y) = 100 x + 310 y + 380 At a production level of 47 55-inch televisions and 29 60-inch televisions, what is the marginal profit associated with selling 55-inch televisions? o a) $350 per 55-inch television O b) -$259 per 55-inch television o ( $206 per 55-inch television O d) -$655 per 55-inch television