An cost schedule for producing pizzas

	Fixed	Variable	Total
Pizzas	Cost ($)	Cost ($)	Cost ($)	cost per pizza	marginal costs
0	40	0	40
1	40	8	48	48	8
2	40	17	57	28.5	9
3	40	27	67	22.33	10
4	40	38	78	19.5	11
5	40	50	90	18	12

If marginal revenue was $7, what would be the profit maximising output?