Probably simple Excell question

[Skunkworks]

I need what is probably a very simple spreadsheet, but I only know the very basics of Excell.

I need the A, B & C cells to be rounded down to the nearest 200, then divided by 200, then multiplied together and the answer displayed in D as shown below.

 

[Skunkworks]

Becuase I didn't think there'd be that much of a crossover between programming and Excell.

Thanks for the help.