<?php
function calc($sum, $pct, $comm) {
$paid = 0;
$payment = 5000;
while ($sum > 0) {
$sum = ($sum * $pct) + $comm;
$paid += $payment;
$sum -= $payment;
}
return $paid + $sum;
}
$iphone = 39999;
$homo = calc($iphone, 1.04, 500);
$soft = calc($iphone, 1.03, 1000);
$straw = calc($iphone+7777, 1.02, 0);
echo "$homo - $soft - $straw\r\n";
PD9waHAKCmZ1bmN0aW9uIGNhbGMoJHN1bSwgJHBjdCwgJGNvbW0pIHsKCSRwYWlkID0gMDsKCSRwYXltZW50ID0gNTAwMDsKCXdoaWxlICgkc3VtID4gMCkgewoJCSRzdW0gID0gKCRzdW0gKiAkcGN0KSArICRjb21tOwoJCSRwYWlkICs9ICRwYXltZW50OwoJCSRzdW0gIC09ICRwYXltZW50OwoJfQoJcmV0dXJuICRwYWlkICsgJHN1bTsKfQoKJGlwaG9uZSA9IDM5OTk5OwoKJGhvbW8gPSBjYWxjKCRpcGhvbmUsIDEuMDQsIDUwMCk7CiRzb2Z0ID0gY2FsYygkaXBob25lLCAxLjAzLCAxMDAwKTsKJHN0cmF3ID0gY2FsYygkaXBob25lKzc3NzcsIDEuMDIsIDApOwoKZWNobyAiJGhvbW8gLSAkc29mdCAtICRzdHJhd1xyXG4iOwoKICAgICAgICAgICAgCg==