Hi,
The best example for periodic billing is monthly rent.
Every month you will be giving a fixed amount for a period of time ( 4500/- per month for 2 years).
In the case of mile stone billing:
Example is a software project. The project will be devided into several stages 'milestones'.(preparation, development, testing, execution)
The project cost will be devided into these stages. When each milestome is reached, the amount will be billed.
Hope you are clear with the basic differences of these two.
Prase
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