Is the statement below true, false or uncertain? Explain your answer. 'Kai consumes only two goods: x1 and x2. His income is $200. The prices of x, and x2 are $1.50 per unit and $2 per unit respectively. Kai's utility function is: U(11, 12) = -[(71-30)2 + (12 - 40) 2]. If his income increases, he won't change the commodity bundle that he buys."