True Profit Formula :
$$\text{True profit %}\;=\;\frac{\text{Net Income}}{\text{Revenue}}\;*\;100$$
Profit Margin formula:
$$\text{Profit Margin formula}\;=\;\frac{\text{Net Profit}}{\text{Total Revenue}}\;*\;100$$
Gross Profit Margin Formula:
$$\text{Gross Profit Margin}\;=\;\frac{\left(\text{Revenue}\;–\;\text{Cost}\right)}{\text{Revenue}}\;\;*\;100%$$
Net Profit Margin Formula:
$$\text{Net Profit Margin}\;=\;\frac{\text{PAT}}{\text{Revenue}}\;*\;100%$$