U2 U2 19. A competitive firm has the three-factor production function f(x, y, z) = (I +y) z . The factor prices used to be wx = $1, wy = $2, and wz = $3. Suppose that the price of factor y doubled while the other two prices stayed the same. Then the cost of production increased by more than 10% but less than 50%. increased by 50%. doubled. stayed the same. increased by more than 50% but did not double. ANS: D DIF: 2 EDP-PP\