Hong Kong Corporation reported the following results in January Sales: 20,000 units Sales amount: $1,200,000, Variable costs: $720,000, Fixed costs: $360,000. Assume that Hong Kong increases the selling price by 10% on February 1. How many units will have to be sold in February to maintain the same level of net income in January? Select one: O a. 20,000. O b. 16,000. O c. 17,776. O d. 19,000