如何在excel中计算特定天数范围后的单元格值？

Question

Here is the table and i need to calculate the amount based upon the days.

cell For days 8 to 14 cell A shows 10000, for days 15 to 21 cell A shows B+C and after 21 days cell A shows B+C+D. After 28 days with every passing week it should add cell D values additionally. for example after 28 days calculation should be B+C+D+D and so on.

Here is the formula I'm using.

=IF(AND($E$10>7,$E$10<=14),$B$10,IF(AND($E$10>14,$E$10<=21),SUM($B$10:$C$10),IF($E$10>21,SUM($B$10:$D$10),""))) 

need help to calculate values after 4 weeks, on every passing week value of cell D should be added.

Answer 1

Try:

=IF($E$10>21, $B$10+$C$10+(INT(($E$10-1)/7)-2)*$D$10, IF($E$10>14,$B$10+$C$10,IF($E$10>7,$B$10,0)))

In Excel, IF statement execution stops at the first logical test that returns TRUE , so by reversing the order of testing, we can eliminate all those AND functions you have in your original.

Then it's just a matter of computing the correct number of D 's to add onto B and C