01 / evidence in
Bring your own numbers.
02 / arithmetic out
Denominators. Not drama.
Changing the currency relabels amounts; it does not convert them. Only combine non-overlapping rows with comparable definitions.
Show your working.
CTR = total clicks ÷ total impressions. CPC = total spend ÷ total clicks. ROAS = attributed revenue ÷ spend, not profit. All tiles follow the filter. Zero denominators return N/A. JSON exports the entire ledger.