Of your customers, 24% have high income, 17% are well educated. Furthermore, 12% both have high income

Question:

Of your customers, 24% have high income, 17% are well educated. Furthermore, 12% both have high income and are well educated. What percentage of the well-educated customers have high income? What does this tell you about a marketing effort that is currently reaching well-educated individuals although you would really prefer to target high-income people?