20 Suppose that Ms. Thomson is currently exhausting her money income by purchasing 10 units of A and 8 units of B at prices of $6 and $3, respectively. The marginal utility of the last units of A and B are 30 and 18, respectively. These data suggest that Ms. Thomson Multiple Choice eBook O has preferences that are at odds with the principle of diminishing marginal utility O considers A and B to be complementary goods. O should buy more A and less B O should buy more B and less A