The Below Figure Shows the Various Combinations of the Goods

The below figure shows the various combinations of the goods X and Y that yield different levels of utility. Figure 6.3 In Figure 6.3, if the price of one unit of good X and good Y is $30 and $20, respectively, the consumer's income is _____.

A) $50
B) $150
C) $400
D) $600
E) $900