<?php
function tinhTienDien($kWh) {
    $tienDien = 0;
 
    if ($kWh > 400) {
        $tienDien += ($kWh - 400) * 2.927;
        $kWh = 400;
    }
    if ($kWh > 300) {
        $tienDien += ($kWh - 300) * 2.834;
        $kWh = 300;
    }
    if ($kWh > 200) {
        $tienDien += ($kWh - 200) * 2.536;
        $kWh = 200;
    }
    if ($kWh > 100) {
        $tienDien += ($kWh - 100) * 2.014;
        $kWh = 100;
    }
    if ($kWh > 50) {
        $tienDien += ($kWh - 50) * 1.734;
        $kWh = 50;
    }
    if ($kWh > 0) {
        $tienDien += $kWh * 1.678;
    }
 
    return $tienDien;
}
 
// Nhập số kWh từ bàn phím
echo "Nhập số kWh tiêu thụ: ";
$kWh = trim(fgets(STDIN)); // Nhận input từ người dùng
$kWh = intval($kWh); // Chuyển thành số nguyên
 
// Tính tiền điện
$tongTien = tinhTienDien($kWh);
 
// Hiển thị kết quả
echo "Số tiền điện phải trả: " . number_format($tongTien, 2) . " VNĐ\n";
?>
 

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