java script emi calc

/*const _principalAmount = ;
const _interestRateYear = ;
const _tenureMonth = ;
;
*/
function calculateEMI() {
    const principalAmount = document.getElementById("principalAmount").value;
    const interestRateYear = document.getElementById("interestRate").value;
    const interestRateMonth = Number(interestRateYear / 1200);
    const tenureMonth = document.getElementById("tenure").value;
    const result = document.getElementById("result");
    const emi=(P * R * (Math.pow((1 + R), N) / (Math.pow((1 + R), N) - 1)));
   // const emi = getEmiReducing(principalAmount, tenureMonth, interestRateMonth);
    result.innerHTML= "EMI is Rs." + emi;

   // return false;
}

/*function getEmiReducing(P, N, R) {
    return (;
}*/