"Add to Percentage" metric added in brain

So here come the ghost of Cashier Dashboard report. Armed with not matching different table heterogeneous for date, 24 metrics.. This gave me cold shiver when I started it. Now having to complete the percentage, it was a tricky part. I added so many derived metrics. Made the report OLAP. Shouldn't be doing that. Keep it Standard Stupid. I played with "Add to ...." is added in my brain.