Khlee, when I copied your example data and used that formula in cell E6, my result was 19200. What result did you get?
When I changed the value of A1 from 24 to 36, the result for E6 was 28800. I'm not sure why it didn't work properly for you.
To explain how the ROW()-5 portion of the formula works, it basically instructs Excel to calculate January as 1 (since January appears in row 6, it takes the current row and subtracts 5). When you copy the formula down to December, it will increment each row by adding one.
I didnt get the answer that 1 want. But i didnt add in =C6*($A$1/12)*1, then start at second by *2*1, *2*1.5, until*2*6. I finally got all answer !
Thank you for yours help !
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