Answer:
D. S > $400,000
Explanation:
His salary is base salary plus commission
salary = 24000 + .08 sales
He wants a salary of at least 56000
56000<= 24000 +.08 sales
Subtract 24000
56000-24000<= 24000-24000+.08*sales
32000<= .08 * sales
Divide each side by .08
32000/.08 <= .08/.08 * sales
400000<= sales