Question

Поступивший в продажу в феврале мобильный телефон стоил 2800 рублей.в сентябре он стал стоить 2520 рублей.на сколько процентов снизилась цена на мобильный телефон в период с февраля по сентябрь.

Answer 1

2800руб-100%
1)2800руб:100%=28(руб)-1%
2)2520руб:28руб=90%
3)100%-90%=10%
.................................................
Проверка.
Если 28руб это 1%,то 10% это 280 руб
Находим разницу стоимости в феврале и сентябре и получаем 280руб.
280руб=280руб

Answer 2

Calculation of Price Reduction Percentage

To calculate the percentage by which the price of the mobile phone decreased from February to September, we can use the following formula:

Price Reduction Percentage = ((Initial Price - Final Price) / Initial Price) * 100

Given that the initial price of the mobile phone in February was 2800 rubles and the final price in September was 2520 rubles, we can substitute these values into the formula:

Price Reduction Percentage = ((2800 - 2520) / 2800) * 100

Calculating this expression, we find that the price of the mobile phone decreased by approximately 10% from February to September.

Therefore, the price of the mobile phone decreased by approximately 10% in the period from February to September.