Question

Большой мешок цемента (50кг) на рынке стоит 250 рублей. При покупке меньшего мешка цемента массой 5 кг в магазине нужно заплатить 100 рублей. На сколько процентов дешевле купить 100 кг цемента на рынке, чем в магазине?

Answer 1

250×2=500р.за 100 кг на рынке 100×20=2000р.за 100кг в магазине Пусть 2000р.=100℅,тогда 500р.=х Решаем пропорцией: (500×100)÷2000=25℅(500кг на рынке) 100%-25%=75%(разница) Ответ: на 75%

Answer 2

Calculation of Price Difference

To calculate the percentage by which it is cheaper to buy 100 kg of cement on the market compared to the store, we need to compare the prices per kilogram in both places.

The market price for a large bag of cement weighing 50 kg is 250 rubles Therefore, the price per kilogram of cement on the market is:

Market price per kilogram = Market price / Weight of the bag = 250 rubles / 50 kg = 5 rubles/kg

The store price for a smaller bag of cement weighing 5 kg is 100 rubles Therefore, the price per kilogram of cement in the store is:

Store price per kilogram = Store price / Weight of the bag = 100 rubles / 5 kg = 20 rubles/kg

Now, we can calculate the price difference between the market and the store:

Price difference per kilogram = Store price per kilogram - Market price per kilogram = 20 rubles/kg - 5 rubles/kg = 15 rubles/kg

To find the percentage by which it is cheaper to buy 100 kg of cement on the market compared to the store, we can use the following formula:

Percentage difference = (Price difference per kilogram / Store price per kilogram) * 100

Substituting the values, we get:

Percentage difference = (15 rubles/kg / 20 rubles/kg) * 100 = 75%

Therefore, it is 75% cheaper to buy 100 kg of cement on the market compared to the store.

Please note that the prices and calculations provided are based on the information given and may not reflect the current market conditions.