Excel - Applying a formula for a range of cells

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I am trying to use a input cell in Excel:
  • In my Excel sheet I have data on A1,A2,A3,A4,A5 containing the amount of ml ink being used.
  • In cell B1 I have the input of Price per ml that I want the user to put in.
  • In C1 I have the formula of "=ROUNDDOWN(SUM(A1*B1),2)"
  • Now if I drag C1 down to C5 I want in my formula A1 to count from A1 to A5 but I don't want B1 to count but be constant.
  • My problem is when I drag down from C1 to C5 that in my formula B1 also counts from B1 to B5 .
  • How can I have B1 as input and remain constant in the formula


  • You have to put a $ between the B and 1 to fix the cell thus your formula become :



Thanks to aquarelle for this tip on the forum.

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