Tina wants to save money for school, tine invests $1,100 in an account that pays an interest rate of 7.25%. how many years will it take the account to reach $6,600? round your answer to the nearest hundredth.

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.