Isabel invested $300 in a fund for 6 years and was paid simple interest. The total interest that she received on the investment was $90. As a percentage, what was the annual interest rate of her investment.

After the experience with great britain having a monarchy, the united states realized that everyone needed to have a voice in the government. the fact that americans had no voice was the main reason for the war. thus, they created a democracy, where the people voted for their representatives and the government ruled with the consent of the people.

I’m confused this is what i’m doing in class but the question is confusing