Bunuel wrote:

Kwasi has S dollars. The purchase price of a television set that Kwasi wants to buy is P dollars plus 8 percent sales tax. Does Kwasi have enough money to purchase the item?

(1) P dollars = $405

(2) P dollars = 0.9S dollars

(1) P = $405, now lets apply 8% tax which is 8/100 * 405 = 32.4

So total purchase price = 405 + 32.4 = $437.4

But without knowing the value of S, we cannot say whether S is greater than equal to 437.4 or not. So not sufficient.

(2) P = 0.9*S. Now sales tax = 8% of 0.9S = 0.08*0.9*S = 0.072*S

So total purchase price = 0.9*S + 0.072*S = 0.972*S

But Kwasi has S dollars, which is definitely more than 0.972*S. Thus she has enough money. Sufficient.

Hence

B answer