Could you help me to tackle the following question?
A company is selling a product at a price of $120 per unit. At this price it is selling 200,000 units per period. It has been estimated that for every $5 increase or reduction in price, sales demand will fall or increase by 10,000 units. At what selling price will total sales revenue per period be maximised?
1. The answer is $110. 2. How can we obtain the selling price if there is no indication about variable cost?
The question does not ask for maximum profit (if it did then we would need the variable cost). It asks for maximum revenue, and maximum revenue occurs when marginal revenue equals zero.