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Your requirement can be very easily satisfied with RadChart. All you need to do, is to create a business object that contains a value. In one case that value will represent income and in the other case it will represent expenditure. Then you just create a List<T>, or another type of enumerable, that contains two instances of your business object, one for income and one for expenditure and then bind RadChart to that list. If your object exposes a property named, say Value, after binding the chart you need to set a ValueBinding to the pie series so that the chart knows that it has to use the Value property to determine the relative sizes of the pie slices.
For more information on how data binding in RadChart works and on RadPieChart please have a look at our online documentation.
Write again if you need further assistance.
the Telerik team
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