A new burger restaurant opened in Tenley on January 1st. On the first day, they sold 52 burgers. Word starts to spread about this restaurant such that their sales went up by 12 burgers on the second day. This trend continues for the rest of the month, so that each day the number of burgers sold is 12 more than the previous day.

How many burgers do they sell on day 7? .

How many total burgers do they sell in the first week? .

How many burgers do they sell on the day 31? .

How many total burgers do they sell during the entire month of January? .