Last month, a retailer sold 120 jar candles at $30 per candle. This month 1 point the retailer is considering putting the candles on sale. They estimate that

for each $2 decrease in price, they will sell 10 additional candles. How much

should the retailer charge for each candle in order to maximize its profit? *

O A) $32

B) $30

C) $28

D) $27

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.