Calculation of Ratio of Payments Within Terms and Beyond Terms 
In the Days Beyond Terms app, on the Ratio of Payments Within Terms / Beyond Terms drill-down, you can see the ratio between payments made within terms and payments made beyond terms as a percentage value. For each month the payment amounts are multiplied by the days within/beyond terms and added together. This total is used to calculate the percentages.
Note
Although days within terms are displayed in the app with preceding minus signs, for the purposes of this calculation the days within terms are regarded as being positive numbers.
Example
Payments
1000 paid 10 days late (beyond terms): 1000 x 10 = 10000
1000 paid 5 days early (within terms): 1000 x 5 = 5000
Total = 10000 + 5000 = 15000
Ratio:
(10000 / 15000) x 100 = 66.67% beyond terms
(5000 / 15000) x 100 = 33.33% within terms
More Information
For information on the Days Beyond Terms app, see Days Beyond Terms.