Bret and Barbara found out that for a given charity, a family whose income is $30,000 gave $400 and a family whose income is $300,000 gave $4,000. Bret says that

the family with the higher income gave more than the family with the lower income in proportion to its earnings. Barbara disagrees. Who is correct and why?

400/30,000 = 0.01333 = 1.33%

4,000/300,000 = 0.01333 = 1.33%