In our daily lives, we often encounter situations where we need to calculate discounts and offers, especially when shopping in supermarkets. Not only is this a great opportunity to save money, but it's also a great scenario for us to apply our math knowledge. Today, we're going to talk about how to beat the numbers game in the supermarket season with a simple percentage calculation!
First, we have to figure out what percentages are all about. Percentages are actually a simple notation, 100% equals a whole, and 50% is half. In the supermarket, if you see a product label that says "20% off", it is actually 80% of the original price.
Suppose a product is priced at 100 yuan and is now discounted by 20%, then its selling price is 80% of the original price. How do you calculate it?It's as simple as multiplying the original price by 80% (or 0.).8) That's it. Therefore, after a 20% discount on 100 yuan of goods, ** becomes 100 08 = $80.
Sometimes, supermarkets offer multiple discounts, such as "buy one get one free" (equal to 50% discount) or "second half price" (equal to 25% discount on the second item). At this point, you can use the percentage to help determine which offer is more cost-effective. For example, if an item costs 100 yuan, then the "buy one get one free" is actually 50 yuan per item, which is cheaper than the average unit price of 75 yuan for the "second half price".
In some cases, the offer is cumulative. For example, a product is 9% off and then 20% off. In this case, you need to calculate the first discount first, and then calculate the second discount based on the new **. For example, the original price of the product is 100 yuan, first 9 discount becomes 90 yuan, and then 8 discount, and the final ** is 90 08 = 72 RMB.
Through these simple examples, we can not only tackle the best challenges more confidently in the supermarket, but also show children the practical application of math knowledge and stimulate their interest in math. Next time you go to the supermarket, bring a pen and paper and try to calculate the various deals, so that math can be a good shopping companion!