<?php
 
$creditBalance=4000;
$percent= 1.03;
$comiss= 1000;
$monthPayment= 5000;
$total=0;
 
for ($month=1; $month<=20; $month++){
	$creditBalance=($creditBalance * $percent) + $comiss - $monthPayment;
	$total= $total+$monthPayment;
	echo "Spustya {$month} mesyac, dolg={$creditBalance}, vsego vyplacheno: {$total}\n";
	if($creditBalance=4000){
		$monthPayment= $monthPayment-$creditbalance;
		break;
	}
	/*if($creditBalance ==0){
		echo "Zaebis!";
		break;*/
 
}

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