Every week Marcela deposits $45 in a bank account that she opened with an initial deposit of $250, so that after n weeks her balance (in dollars) is 250+45n. Her brother Ronnie withdraws $30 each week from his own bank account, which he opened with an initial deposit of $145, so that after n weeks his balance is 145-30n. Express the ratio of Marcela's balance to ronnie's as a rational function, and simplify