Arithmetic operators in PHP - Mini Project: Build & Apply

Arithmetic Operators in PHP

📖 Scenario: You are helping a small shop owner calculate prices and discounts using simple math.

🎯 Goal: Build a PHP script that uses arithmetic operators to calculate total price, discount, and final price.

📋 What You'll Learn

Create variables with exact values

Use arithmetic operators: +, -, *, /

Print the final calculated result

💡 Why This Matters

🌍 Real World

Calculating prices, discounts, and totals is common in shopping and billing systems.

💼 Career

Understanding arithmetic operators is essential for backend programming, especially in e-commerce and finance applications.

1

Create initial price variables

Create two variables called $price1 and $price2 with values 100 and 50 respectively.

PHP

<?php

// Create variables $price1 and $price2 with values 100 and 50
// Your code here

Need a hint?

Use the = operator to assign values to variables.

2

Add a discount percentage variable

Create a variable called $discountPercent and set it to 10.

PHP

<?php

$price1 = 100;
$price2 = 50;

// Create variable $discountPercent with value 10
// Your code here

Need a hint?

Remember to end each statement with a semicolon.

3

Calculate total price and discount amount

Create a variable $totalPrice that adds $price1 and $price2. Then create a variable $discountAmount that calculates $totalPrice times $discountPercent divided by 100.

PHP

<?php

$price1 = 100;
$price2 = 50;
$discountPercent = 10;

// Calculate $totalPrice as sum of $price1 and $price2
// Calculate $discountAmount as $totalPrice * $discountPercent / 100
// Your code here

Need a hint?

Use + to add and * and / for multiplication and division.

4

Calculate final price and print it

Create a variable $finalPrice that subtracts $discountAmount from $totalPrice. Then print the text "Final price: " followed by the value of $finalPrice.

PHP

<?php

$price1 = 100;
$price2 = 50;
$discountPercent = 10;

$totalPrice = $price1 + $price2;
$discountAmount = $totalPrice * $discountPercent / 100;

// Calculate $finalPrice as $totalPrice - $discountAmount
// Print "Final price: " and $finalPrice
// Your code here

Need a hint?

Use - to subtract and print() to show output.