A Competitive Firm Has the Three-Factor Production Function F (X

Multiple Choice

A competitive firm has the three-factor production function f (x, y, z) = (x + y) ^1/2 z ^1/2.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

A) increased by more than 10% but less than 50%.
B) increased by 50%.
C) doubled.
D) stayed the same.
E) increased by more than 50% but did not double.