conversations.from: human
conversations.value: Noah, who loves his Grammy, calls her every week to talk about his day. If each call lasts 30 minutes and he is charged $0.05 per call minute, how much would he be billed if he makes the calls for a year?
  Solve it.
conversations.from: assistant
conversations.value: A year has 52 weeks, so if he talks for 30 minutes every week, the total number of call hours is 52*30 = 1560 minutes.
  Since he is charged 0.05 cents per call, the total cost is 1560*.05 = 78 dollars