A company has established that the relationship between sale price for one of its product and the quantity sold per month is approximately D = 780 -10p units (D is the demand or quantity sold per month, and p is the price in pesos). The fixed cost is P800 per month, and the variable cost is P30 per unit produced. What number of units, D*, should be produced per month and sold to maximize net profit? What is the maximum profit per month related to the product?