Arithmetic operators in Ruby - Mini Project: Build & Apply

Arithmetic operators

📖 Scenario: You are helping a small shop owner calculate prices and discounts for products.

🎯 Goal: Build a simple Ruby program that uses arithmetic operators to calculate total price, discount, and final price.

📋 What You'll Learn

Create variables with exact values for product price and quantity

Create a variable for discount rate

Calculate total price and discount amount using arithmetic operators

Print the final price after discount

💡 Why This Matters

🌍 Real World

Calculating prices and discounts is common in shops and online stores.

💼 Career

Understanding arithmetic operators is essential for programming tasks involving calculations.

1

Create initial product data

Create a variable called price and set it to 50. Create a variable called quantity and set it to 3.

Ruby

# Create variables price and quantity with given values
# Your code here

Need a hint?

Use = to assign values to variables.

2

Add discount rate

Create a variable called discount_rate and set it to 0.1 (which means 10%).

Ruby

price = 50
quantity = 3
# Create variable discount_rate with value 0.1
# Your code here

Need a hint?

Discount rate is a decimal number representing percentage.

3

Calculate total price and discount

Create a variable called total_price that multiplies price and quantity. Create a variable called discount_amount that multiplies total_price and discount_rate.

Ruby

price = 50
quantity = 3
discount_rate = 0.1
# Calculate total_price and discount_amount
# Your code here

Need a hint?

Use * for multiplication.

4

Print final price after discount

Create a variable called final_price that subtracts discount_amount from total_price. Then print final_price using puts.

Ruby

price = 50
quantity = 3
discount_rate = 0.1
total_price = price * quantity
discount_amount = total_price * discount_rate
# Calculate final_price and print it
# Your code here

Need a hint?

Use - to subtract and puts to print.