Предмет: Математика, автор: yelisavetakulish

Банк дає 15% річних. Поклавши до банку певну сумму, через рік вкладник отримав 900 гн прибутку. Яким був вклад?

Ответы

Автор ответа: sofiyavictoria

Ответ:

6000 гн

Пошаговое объяснение:

Пусть первоначальный вклад был х гн и это 100%. А новый стал

(х+900) гн и это 100%+15%=115%. Составим пропорцию

х гн - 100%

(х+900) гн - 115% х*115=100*(х+900)

115х=100х+90000

115х-100х=90000

15х=90000

х=90000:15

х=6000 гн - первоначальный вклад в банк

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