Предмет: Математика, автор: potyrnak270583

ціна товару становить 140 грн.Спочатку його ціну підвищили на 20%, а потім знизили на 25 %.Якою стала ціна товару після цих змін? На скільки відсотків зьінилася початкова ціна ?

grishapetrov26rus: изначальная стоимость товара 140, её повышают на 20%, т.е. (140:100)*(100+20)=1,4*120=168, а потом занизили на 25% от измененной стоимости, т.е. (168:100)*(100-25)=1,68*75=126 Ответ:126

potyrnak270583: ЩИРО ВДЯЧНА...А НА СКІЛЬКИ ВІДСОТКІВ ЗМІНИЛАЯ ПОЧАТКОВА ЦІНА ?

Ответы

Автор ответа: iosiffinikov

Ответ:

126грн

Цена уменьшилась на 10%

Пошаговое объяснение:

Увеличение на 20% - это умножение цены на 120/100=1,2

Уменьшение на 25% - это умножение на (100-25)/100=0,75

3начит цена стала

140*1,2*0,75=14*12*3/4=14*9=126 ГРН

Цена уменьшилась на 140-126=14 грн

Значит она уменьшилась на (14/140)*100%=10 %

potyrnak270583: ЩИРО ВДЯЧНА!!! А НА СКІЛЬКИ ВІДСОТКІВ ЗМІНИЛАСЯ ПОЧАТКОВА ЦІНА?

iosiffinikov: Вроде, написал : на 10%

potyrnak270583: ДЯКУЮ !!!

Автор ответа: janaro

Ответ:

Ціна знизилася на 10%

Пошаговое объяснение:

140*(100+20):100= 140*120:100=168грн

168*(100-25):100168*75:100=126грн

140-126=14грн

14*100:140=10%

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