Diragio Lawn Care cuts 42 lawns every week. Each lawn uses 316 of a tank of gas when it is cut (on average).

Part A:
If the lawnmower had no gas at the start of the week, how many times would it have to be completely filled during the week? Show your work.

Part B:
The cost for a full tank of gas in the lawnmower is $20. How much does it cost (in lawnmower fuel only) to mow one average lawn? Show your work.