Mortgage_calculator

mortgage_calculator.js

var calculate_payment = function(loan_amount, interest_rate){
  var _rate = interest_rate / 1200;
  var pi = ( _rate + (_rate / (Math.pow((1 + _rate), 360) - 1) ) ) * loan_amount;
  var taxes = (loan_amount * 0.01) / 12;
  var ins = 40;
  var mi = (loan_amount * 0.0125) / 12;
  return pi + taxes + ins + mi;
}

for(var i = 120; i <= 160; i++){ 
  console.log( i * 1000, calculate_payment(i * 1000, 3.85) )
}
/*
120000 827.5698786882266
121000 834.1329610106284
122000 840.6960433330303
123000 847.2591256554322
124000 853.8222079778341
125000 860.385290300236
126000 866.9483726226379
127000 873.5114549450398
128000 880.0745372674417
129000 886.6376195898436
130000 893.2007019122454
131000 899.7637842346473
132000 906.3268665570492
133000 912.889948879451
134000 919.4530312018529
135000 926.0161135242548
136000 932.5791958466567
137000 939.1422781690586
138000 945.7053604914605
139000 952.2684428138624
140000 958.8315251362643
141000 965.3946074586662
142000 971.9576897810681
143000 978.52077210347
144000 985.0838544258719
145000 991.6469367482738
146000 998.2100190706756
147000 1004.7731013930775
148000 1011.3361837154794
149000 1017.8992660378813
150000 1024.4623483602832
151000 1031.025430682685
152000 1037.588513005087
153000 1044.1515953274888
154000 1050.7146776498907
155000 1057.2777599722926
156000 1063.8408422946945
157000 1070.4039246170964
158000 1076.9670069394983
159000 1083.5300892619002
160000 1090.0931715843021
*/