A profit-maximizing price rises to the point at which further: a. increases will cause proportionate decreases in the number of units sold. b. decreases will cause disproportionate decreases in the number of units sold. c. increases will cause disproportionate decreases in the number of units sold. d. increases will cause disproportionate increases in the number of units sold. A product is priced to sell for $12 with average variable costs of $8. The company expects to earn a profit of $400,000 with its total fixed costs of $120,000. The minimum number of units that must be sold in order to reach this target return is: