question: Jenna has 4 roommates. Each month the electricity bill is $100. How much will each roommate pay per year for electricity, if they divide the share equally?
answer: There are 12 months in a year, so the total electricity for the year will cost 100*12 =$<<100*12=1200>>1200.
  Since there are 5 roommates, each roommate will pay 1200/5=$<<1200/5=240>>240 in a year.
  #### 240