A retired woman has $80,000 to invest. She has chosen one relatively safe investment fund that has an annual yield of 9% and another riskier fund that has a 13% annual yield. How much should she invest in each fund if she would like to earn $8,000 per year from her investments?
9% fund $
13% fund $

One safe investment pays 10% per year, and a more risky investment pays 18% per year. A woman who has $144,800 to invest would like to have an income of $19,840 per year from her investments. How much should she invest at each rate?
10% $
18% $