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? Let's think first. Chain of thought:
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.
Therefore, the answer is 78.