With the facts that were given, we can calculate
Low volume: 30 pizzas per shift x 3 shifts/day x 365 days = 32,850 pizzas
High volume: 40 pizzas per shift x 3 shifts/day x 365 days = 43,800 pizzas
Average: 35 pizzas per shift x 3 shifts/day x 365 days = 38,325 pizzas