ARITMATIKA SOSIAL : MATEMATIKA KELAS 7 SMP

Summary

In this educational video, Febri teaches seventh-grade students about key arithmetic concepts, including profit and loss, taxes, discounts, weight calculations (bruto, tara, neto), and bank interest. The video explains formulas for calculating profit, loss, and percentages, as well as how to apply tax and discount calculations in real-life situations. Febri also covers the basics of bank interest, demonstrating how to compute it using examples. The lesson aims to make these concepts clear and practical for students, encouraging them to take notes for better understanding and review.

Takeaways

• 😀 Understanding profit and loss: Profit is the difference between the selling price and the purchase price, while loss occurs when the purchase price exceeds the selling price.
• 😀 Formula for profit: Profit = Selling Price - Purchase Price.
• 😀 Formula for loss: Loss = Purchase Price - Selling Price.
• 😀 To calculate percentage profit, use the formula: Profit Percentage = (Profit / Purchase Price) × 100%.
• 😀 To calculate percentage loss, use the formula: Loss Percentage = (Loss / Purchase Price) × 100%.
• 😀 The formula to find the purchase price if the profit percentage is known is: Purchase Price = (100 / (100 + Profit Percentage)) × Selling Price.
• 😀 The formula to find the selling price if the profit percentage is known is: Selling Price = (100 + Profit Percentage) / 100 × Purchase Price.
• 😀 Taxes are mandatory payments to the government, and there are two main types: income tax (pajak penghasilan) and value-added tax (pajak pertambahan nilai).
• 😀 Discounts are reductions applied to the original price of a product, and the discount amount is calculated using the formula: Discount = (Discount Percentage × Original Price).
• 😀 Bruto (gross) is the total weight including the packaging, while neto (net) is the weight of the product without the packaging, calculated by subtracting the tare (weight of the packaging) from the gross weight.
• 😀 Bank interest: When saving in a bank, the balance increases due to interest, and the interest is calculated using the formula: Interest = (Months / 12) × Interest Percentage × Initial Deposit.

Q & A

What is the formula to calculate profit in a sale?

The formula to calculate profit is: Profit = Selling Price - Buying Price.

How do you calculate loss in a sale?

To calculate loss, you subtract the Selling Price from the Buying Price: Loss = Buying Price - Selling Price.

How do you calculate the percentage of profit?

The percentage of profit is calculated by: Profit Percentage = (Profit / Buying Price) * 100%.

What is the formula to find the selling price when the profit percentage is known?

To find the selling price when the profit percentage is known: Selling Price = (100 + Profit Percentage) / 100 * Buying Price.

How do you calculate the buying price if the selling price and profit percentage are known?

To calculate the buying price: Buying Price = (100 / (100 + Profit Percentage)) * Selling Price.

What is the difference between 'bruto', 'tara', and 'neto' weights?

'Bruto' is the total weight including the container, 'tara' is the weight of the container, and 'neto' is the weight of the contents alone, calculated as Bruto - Tara.

How do you calculate tax on a product (PPN)?

The tax (PPN) is calculated by multiplying the percentage of tax by the price of the product before tax: PPN = Tax Percentage * Price Before Tax.

What is the formula to calculate the total price including tax?

To calculate the total price including tax, add the tax (PPN) to the price before tax: Total Price = Price Before Tax + PPN.

How is a discount on an item calculated?

A discount is calculated by multiplying the discount percentage by the original price: Discount = Discount Percentage * Original Price.

How do you calculate the final price after a discount?

To calculate the final price after a discount, subtract the discount from the original price: Final Price = Original Price - Discount.