EMIs or Equated Monthly Installments refer to the monthly payments you make to the lender to repay your loan. These payments include the principal amount as well as the interest i.e. EMI = Principal Amount + Interest on Principal amount. Mathematically, EMI for the Gemini can be calculated using the following formula: {P x R x (1+R)^N / [(1+R)^N-1]} where, P = Principal amount of the loan, R = Rate of interest and N = Number of monthly installments. For Example:- If the principal amount for a commercial vehicle loan is Rs. 270000- on an annual rate of interest of 10.5 for a tenure of 5 years then EMI will be Rs 5803. The rate of interest (R) on your loan is calculated monthly i.e. (R= Annual rate of interest/12/100). For instance, if R = 10.5 per annum, then R= 10.5/12 = 0.875.