https://algysautos.com/wp-content/plugins/automotive/js/financing-calculator.js?ver=18.8

1window.automotiveCalculate = function(calculator) {
2  if(calculator.length){
3    var cost        = calculator.find('.cost').val();
4    var downPayment = calculator.find('.down_payment').val();
5    var interest    = calculator.find('.interest').val();
6    var loanYears   = calculator.find('.loan_years').val();
7    var frequency   = calculator.find('.frequency').val();
8
9    var frequencyRate = '';
10
11    if (!cost || !downPayment || !interest || !loanYears || isNaN(cost) || isNaN(downPayment) || isNaN(interest) || isNaN(loanYears)) {
12      if (!cost || isNaN(cost)) {
13        calculator.find('.cost').addClass('error');
14      } else {
15        calculator.find('.cost').removeClass('error');
16      }
17
18      if (!downPayment || isNaN(downPayment)) {
19        calculator.find('.down_payment').addClass('error');
20      } else {
21        calculator.find('.down_payment').removeClass('error');
22      }
23
24      if (!interest || isNaN(interest)) {
25        calculator.find('.interest').addClass('error');
26      } else {
27        calculator.find('.interest').removeClass('error');
28      }
29
30      if (!loanYears || isNaN(loanYears)) {
31        calculator.find('.loan_years').addClass('error');
32      } else {
33        calculator.find('.loan_years').removeClass('error');
34      }
35
36      return;
37    }
38
39    calculator.find('input').removeClass('error');
40
41    switch (frequency) {
42      case '0':
43        frequencyRate = 26;
44        break;
45      case '1':
46        frequencyRate = 52;
47        break;
48      case '2':
49        frequencyRate = 12;
50        break;
51    }
52
53    var payment = 0;
54    var payments = 0;
55    var difference = 0;
56
57    // 0% interest rate
58    if (interest === 0 || interest === '0') {
59      difference = cost - downPayment;
60      payments = loanYears * frequencyRate;
61
62      payment = Math.floor((difference) / payments);
63    } else {
64      var interestRate = (interest) / 100;
65      var rate = interestRate / frequencyRate;
66      payments = loanYears * frequencyRate;
67      difference = cost - downPayment;
68
69      payment = Math.floor((difference * rate) / (1 - Math.pow((1 + rate), (-1 * payments))) * 100) / 100;
70    }
71
72    if (typeof listing_ajax.currency_separator !== 'undefined' && typeof payment !== 'undefined') {
73      payment = parseInt(payment).toLocaleString();
74    }
75
76    var currencySymbol = (typeof calculator.data('currency-symbol') !== 'undefined' ? calculator.data('currency-symbol') : false);
77
78    // backwards compatibility
79    if (currencySymbol === false) {
80      currencySymbol = (typeof listing_ajax.currency_symbol !== 'undefined' ? listing_ajax.currency_symbol : '$');
81    }
82
83    calculator.find('.payments').text(payments);
84    if(listing_ajax.currency_placement == 0){
85      calculator.find('.payment_amount').text(payment + currencySymbol);
86    } else {
87      calculator.find('.payment_amount').text(currencySymbol + payment);
88    }
89  }
90}