pro rata

Rob said in his mail "we book a monthly revenue pro rata and actual costs of the month."
pro rata 按比例
 adjective
(from Latin, formal) (of a payment or share of sth) calculated according to how much of sth has been used, the amount of work done, etc.
Synonym: PROPORTIONATE
If costs go up, there will be a pro rata increase in prices.
Leave entitlement is calculated on a pro rata basis, according to length of service.
pro rata adverb:
Prices will increase pro rata.
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