Apportion
From ACT Wiki
1. To allocate a money amount on a time basis.
For example
total profits of EUR 100,000 for a period of one year (365 days) consisting of a one month (30 days) period and an 11 months (335 days) period would be time-apportioned as follows:
One month period:
EUR 100,000 x 30/365
= EUR 8,219
11 months period:
EUR 100,000 x 335/365
= EUR 91,781
(This is also known as 'time-apportionment'.)
2.
To allocate a money amount on any other systematic basis.
For example, to allocate the total costs of a shared building on the basis of floor areas.
3.
To allocate any amount on a systematic basis.