In: Economics
Hint: if you use the Lagrangian method, problem 2.3 will be as follows.
If X denotes the number of CDs and Y denotes the number of DVDs: Using the Lagrangian multiplier method, determine the values of X and Y that maximize the value of the function U=(X^0.5)(Y^0.5) subject to 200=5X+20Y
Thus, problem II asks to solve followings :
Max U=(X^0.5)(Y^0.5)
s.t. 200= 5X +20Y