Question

Цены на апельсины сначало выросли на 70%,а затем понизились на 40%.Сколько изначально стоили апельсины, если после понижения цен они стали стоить 102 рубля? Запишите РЕШЕНИЕ и ответ, дам 15 балов очень нужно

Answer 1

Ответ:

100 руб

Пошаговое объяснение:

х-первоначальная стоимость

х*1,7*0,6=102

1,02х=102

х=100 руб. стоили апельсины изначально.

проверка:

100*0,7+100=170 руб. стоимость апельсинов после увеличения.

170*(100-40)/100=170*0,6=102 руб. стоимость после понижения, что соответствует условию задачи.

Answer 2

60-102

х-100 х=100*60/102= приб. 52

Answer 3

Problem Analysis

We are given that the price of oranges initially increased by 70% and then decreased by 40%. We need to determine the initial price of the oranges if they currently cost 102 rubles.

Solution

Let's assume the initial price of the oranges is x rubles.

According to the given information: - The price of the oranges initially increased by 70%, which means it became x + 0.7x = 1.7x rubles. - The price of the oranges then decreased by 40%, which means it became 1.7x - 0.4(1.7x) = 1.7x - 0.68x = 1.02x rubles.

We are given that the current price of the oranges is 102 rubles. Therefore, we can set up the equation:

1.02x = 102

To find the value of x, we can divide both sides of the equation by 1.02:

x = 102 / 1.02

Now we can calculate the value of x:

x = 100

Therefore, the initial price of the oranges was 100 rubles.

Answer

The initial price of the oranges was 100 rubles.