Paypal Fee Calculator

paypal.js

// Paypal Fee Calculator

// default sum
var sum = 100;
// default rate
feeRate = 0.049;
// default fee
fee = sum * feeRate + 0.3
// to get sum you need to demand to your client sum2
var sum2 = (0.3 + sum) / (1 - feeRate)
// paypal fees deppends on value of sum
switch (true) {
    case (sum >= 0 && sum <= 3000):
        //alert(sum2);
        //alert(sum- fee);
        break;
    case (sum > 3000 && sum <= 10000):
        feeRate = 0.044;


        break;
    case (sum > 10000 && sum <= 100000):
        feeRate = 0.042;


        break;
    case (sum > 100000):
        feeRate = 0.039;


        break;

}