Suppose that in panel (a) of Figure 27-2, the vertical distances to points F and A are $10 per unit and $2 per unit, and Qm is 1,000 units. To measure the degree of monopoly power, economists often examine the differential between price and marginal cost as a percentage of the price. What would be the value of this measure of monopoly power for the natural monopolist depicted in panel (a) of the figure?