bschool83 wrote:

Date of Purchase

Percent Reduction

July 1 through July 7

5%

July 8 through July 14

30%

July 15 through July 21

55%

July 22 through July 28

70%

In the table above is shown the percent reduction in the price of every item in a store off the original price of that item on June 30 of that year. The table is for the 28 days immediately after June 30 of that year. If on July n of that year, Bill bought a suit that originally cost $450, what is the value of n?

(1) Bill paid $112.50 less than he would have if he had bought it the day before.

(2) Bill paid $202.50 for the suit.

(1) insuff..because we don't know the discounted price/any price for which he would have paid $112.5.

(2)202.5 is what percent less of 450...

450(1-x/100)=202.5

x=55%

date "n" could be anything between july15-july21...not suff....

Combining both Bill paid $112.50 less than he would have if he had bought it the day before

means bill paid (202.5+112.5=$315) if he bought with any previous discount a day before.

315 is 30% less than 450.

So he must bought on july 15

Ans C