Wealthiest Donors Gave 9 Percent of Their Income in 2007, Study Finds

People who did not volunteer donated $35,127, on average, while those who spent from 101 to 200 hours volunteering donated an average of $124,267.

And families whose children participated in grant-making decisions gave $243,935, on average, more than triple the amount donated by those whose children were not involved in any kind of giving.