Objective

By the end of this lesson, you will be able to apply arithmetic concepts to your bath bomb business, including calculating costs, pricing, and profits.

Materials and Prep

• Paper and pencil
• Calculator (optional)
• Knowledge of basic arithmetic operations (addition, subtraction, multiplication, division)

Activities

1. Activity 1: Cost Calculation

   Research the cost of materials needed to make bath bombs, such as essential oils, baking soda, and molds. Write down the prices of each item and calculate the total cost of making one bath bomb.

2. Activity 2: Pricing Strategy

   Determine how much you want to earn as profit for each bath bomb. Consider factors like your time, effort, and desired income. Add the profit amount to the total cost of making one bath bomb to determine the selling price.

3. Activity 3: Profit Calculation

   Estimate the number of bath bombs you can make in a week. Multiply the selling price by the estimated quantity to calculate your potential weekly revenue. Subtract the total cost of materials for the week to find your weekly profit.

Eighth Grade Talking Points

• "In your bath bomb business, it is important to understand the costs involved. Let's calculate the total cost of making one bath bomb by adding up the prices of all the materials."
• "To determine the selling price, we need to consider the profit we want to earn. Adding the profit to the total cost will give us the selling price per bath bomb."
• "Now, let's think about how many bath bombs you can make in a week. Multiplying the selling price by the estimated quantity will give us your potential weekly revenue."
• "To find your weekly profit, subtract the total cost of materials for the week from your weekly revenue."