Overall it looks like about 14.5% ($92,000) of their donations ($635,000) actually went to "Grants and Other Assistance" and the remainder was eaten up in overhead.
It very much depends on the nature of the charity.
Mrs Don is Treasurer and Trustee for a local charity which provides volunteers to help out families who have come to the attention of social services and where there is a child in the house under the age of five.
Apart from a small sum retained for reserves, every single penny raised goes to overhead whether it's the (small) team of professional administrators recruiting volunteers and coordinating the efforts of the volunteers and families, training and overseeing the volunteers or paying the volunteers' expenses.
None of the money raised ever goes directly to the families in need.