Jessica has an account with a credit union. her account earns 2.7% simple interest yearly. exactly a year and a half ago, she opened her account with $900. how much interest has she earned so far?

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?