A company has established that the relationship between the sales price for one of its products and the quantity sold per month is approximately p=650.3D (D is the demand or quantity sold per month and p is the price in dollars). The fixed cost is $900 per month and the variable cost is $20 per unit produced. a. What is the maximum profit per month for this product? b. What is the range of profitable demand during a month? a. The maximum profit per month for this product is $ (Round to the nearest dollar) b. The range of profitable demand during a month is from units to units. (Round up the lower limit and down the upper limit to the nearest whole number.)