<?php
 
error_reporting(-1);
 
$creditBalance = 40000; 
$percent = 1.03;
$servicePayment = 1000; 
$monthlyPayment = 5000; 
$paymentTotal = 0; 
for ($month = 1; $month <= 20; $month ++) {
 
	$creditBalance = ( $creditBalance * $percent ) + $servicePayment - $monthlyPayment;
	$paymentTotal = $paymentTotal + $monthlyPayment; 
      if ($creditBalance < 0) {
          echo "С меня хватит!\n";
          $paymentTotal= $paymentTotal + $creditBalance;
	$creditBalance=0;
	echo "{$month} месяц спустя: долг = {$creditBalance} руб, выплачено всего {$paymentTotal} руб. \n";
 
          break;
      }
}

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