The Following Table Shows the Utility (Measured in Dollars)which Lisa

Multiple Choice

The following table shows the utility (measured in dollars) which Lisa derives from water (in 50 litre drums) and diamonds (uncut 1 carat stones) .

-Refer to the above information to answer this question.If the price of both water and diamonds is $120 per unit,and Lisa has $720 to spend,how many units of each would she purchase?

A) 6 water.
B) 4 water and 2 diamonds.
C) 3 water and 3 diamonds.
D) 2 water and 3 diamonds.
E) 2 water and 4 diamonds.