Final answer:
The minimum number of investors it would take to vote to change the company's top management depends on the majority voting rule. Investors 1 and 2 cannot be certain of always getting their way in how the company will be run.
Step-by-step explanation:
The minimum number of investors it would take to vote to change the company's top management is determined by the majority voting rule. In this case, the majority voting rule means that more than 50% of the total outstanding shares need to be in favor of the change. To calculate this, we add up the number of shares owned by investors 1 and 2 (20,000 + 18,000 = 38,000) and divide it by the total number of outstanding shares (100,000). This gives us a percentage of 38%. Since this is less than 50%, investors 1 and 2 would not be able to change the company's top management on their own.