How can I accumulate values from a cell that is constantly changing it content? In cell A3 I have a price coming from the web and it is constantly changing value. I cell B2 I have another price (this price never changes). In cell B3 I have a formula to calculate 10% if the changing price is lower than the permanent price as =MAX(A3,B2)*0.1 Now, what I need is accumulate the value resulting from that formula (result from the formula changes frequently depending on the value which is coming from the web and it is constantly changing.)