Dollar City is having an end-of-year sale, and all prices are being slashed. On the graph below, the xxx-axis represents the old price, and the yyy-axis represents the new sale price, in dollars. Not to be outdone, Penny World, whose manager was a math major, has announced that all sale prices (S)(S)left parenthesis, S, right parenthesis will be determined according to the equation :
S=(0.15)PS=(0.15)PS, equals, left parenthesis, 0, point, 15, right parenthesis, P,
where PPP is the original price.
Which store’s sale is better?