Could anyone help me understand why Excel is arriving at -16? I'll try attaching workbook in the next post as it's not letting me attach it with this post.

In cell C9 I was hoping to see 35, but I have no idea why it's returning -16?

A6 = 6.515
A9 = 4.800
B8= 18

=IF(A6>A9, ROUNDUP(A6/A9,0)-1*B8, )
If results to True,
Then I'd expect 6.515/4.80= 1.357
Then I'd expect it to roundup = 2
Then *18 = 136
Then -1= 35

I'm about to try array formulas but quite embarassed I can't understand basic precedence right.