please help me with this


I'm trying to enter a formula that gives me the results in the equation below.


when I enter =if(c6-c7<=0,"0",c6-c7*10338/21000.3) I get 14.89

3.72 is the correct answer that I need.  My only cell references are in column C.

I've been doing the calculation on my phone and thought I could just add a column and put in the formula and have the answer right there.  (3.72 tells me I will need 3.72 hours to fill my water tank.)

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