John inherited $25,000 and invested part of it in a money market account, part in municipal bonds, and part in a mutual fund. After one year, he received a total of $1,620 in simple interest from the three investments. The money market paid 6% annually, the bonds paid 7% annually, and the mutual fund paid 8% annually. There was $6,000 more invested in the bonds than the mutual funds. • Identify your variables.

• Write an equation that shows the total amount invested in each category.

• Write an equation that shows the interest rate paid in each category.

• Write an equation that shows the comparison of the funds.

• Solve the equation.

• How much did John invest in each category.