How to write my Conversion Rate Return on Investment Calculator

Conversion Rate Return Investment Calculator Month Month Month Month Month Month Month Month Month Month Month Month Total. Unique Leads Hits from Campaign Tracked Sales Count Estimated Untracked Sales Count Conversion Rate for Campaign DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV. Commissions Owed Sales Taxes Owed Sales Shipping Costs Other Costs Owed Sales Campaign Management Costs Cost Total Costs Total Tracked Sales Amount Estimated Untracked Amount Value Leads Generated Benefit Benefit Benefit Benefit Total Benefits Net Ratio DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV. ROI DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV DIV.