Suppose that firms face the following production function: Q = L^(1/3)K^(2/3) and firms' objective output is 96. Suppose that initially price of labor (L)=w=4 and price of capital (K)=r=1 and then price of labor (w) goes up to 32. What is the percentage of cost saving due to the ability to substitute?

a) 33.3%

b)66.7%

c)25%

d)22.2%