\fAccording to the midpoint method, the price elasticityr of demand between points A and B is approximately '7 . Suppose the price of bikes is currentlyr $25 per hike, shown as point B on the initial graph. Because the demand between points A and B is v , a $25perbike increase in price will lead to V in total revenue per day. In general, in order for a price decrease to cause a decrease in total revenue, demand must he V .