Celine buys a new MP3 player for $90 . She receives consumer surplus of $15 on her purchase if her willingness to pay is

Steve uses $300 from his paycheck to pay off his credit card balance. Based on this information:

A. Steve's saving has decreased by $300. B. Steve's saving has increased by $300. C. Steve has a capital loss of $300. D. Steve's wealth is unchanged.

If the price of a good rises by 10% and the percentage increase in the total amount consumers spend on the good is 15%, then the good is

A. perfectly inelastic. B. unit elastic. C. inelastic. D. elastic.