Q. After inheriting $30,000 from a rich aunt, David decides to place the money in three different investments:

= a savings account paying 5%

= a bond account paying 7%

= a stock account paying 9%

After 1 year, he earned $2080 in interest. Find how much was invested at each rate if $8000 less was invested at 9% than at 7%.

Please explain how I can set up this mind boggling question for this mathematically challenged grasshopper. Thank you!