In the summary report I have three charts with the currency field. The two charts show 'average' and 'total' but the other chart shows 'percentage' of responses - in other words the report treats that field not as a number but as text. The filed is designated as a currency in the desing view. Why is it treated as text?
The percentage of responses is a reference for the responses of that field. If you don't want it to show, you can disable it.
Hope this help,