Financial Algebra Word Problem
Sam invests the earnings of $3000 from her full-time job. She invests part of the money at 5%/year, and the rest at 4%/year. After one year, these investments earn $140 simple interest. How much did she invest at each rate?
What reason might you imagine for her to divide her money between two different accounts when she could obviously get more money in the one giving 5% interest?