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Словарь
percent процент
87%
[pəˈsent]
shortcut сокращенный(ое)
[ˈʃɔːtkʌt]
convert преобразовать
[ˈkɔnvɜːt]
equation уравнение
[ɪˈkweɪʃn]
2 + x = 6
successive последовательный
1, 2, 3, 4…
[səkˈsesɪv]
principle основная сумма
200$
[ˈprɪnsəpəl]
rate ставка
12% / мес
[reɪt]
part-whole

relationship
отношение

целого
к части
8 / 100
[pɑːt] [həʊl] [rɪˈleɪʃənʃɪp]
compound

interest
сложный

процент
200$ + 20% + 12% + …
[ˈkɔmpaʊnd ˈɪntrɪst]
Теория
«percent» ~ «per one hundred»
… на каждую сотню
75% студентов любит шоколад.
75 «на каждую сотню» студентов любит шоколад.
75 «на каждую сотню»…
75%
75 / 100 0.75
дробное

значение
десятичное

значение
Переводим проценты в дроби…
45% 100%3%
45/100 100/1003/100
3/100
несократимая дробь
9/20
несократимая дробь
1
целое число
Переводим проценты в десятичные числа…
45% 100%3%
45/100 100/1003/100
0.03 0.45 1
целое число
Переводим дроби в проценты…
9/20
1/2
~ >
~ >
9х(5)/20х(5)
1х(50)/2х(50)
~ >
~ >
45%
50%
1/5 ~ > 1х(20)/5х(20) ~ > 20%
Переводим десятичные значения в проценты…
0.78
2.45
~ >
~ >
0.78х100
2.45х100
~ >
~ >
78%
245%
0.04 ~ > 0.04х100 ~ > 4%
Было + Изменение = Стало
какой процент?
100% Х% Y%
% Изменение = Изменение / Было х 100
процент значение значение
% Стало = Стало / Было х 100
процент значение значение
на 10% больше ~> 110%
150% ~> на 50% больше
(+пример)
… стоимость проезда 10 руб., через

месяц проезд подорожал на 20%,
а через еще один месяц подорожал

на 30%.
Сколько стоит билет сейчас?
(«последовательные» проценты)
билет стоит = 10 руб. х 1.2 х 1.3 = 16 руб.
результат = исходное х Y х Z x …
изменение исходного значения
в процентах записанное в виде
десятичных чисел
Сложные проценты…
результат = P x (1 + r/n)nt
первоначальная
сумма
процентная ставка

(десятичное число)
кол-во раз в году
кол-во лет
(+пример)
Практика
Задание №1
x% от y равно 10. y% от 120 равно 48. Чему равен х?
Задание №2
Игровая приставка была понижена в цене на 30% и была продана за 84$.

Какова была первоначальная стоимость приставки?
Задание №3
Если значение у уменьшили на 20%, а затем увеличили на 60%, то
каково будет новое значение у выраженное указанными изменениями?
Задание №4
Залог на машину предоставляется под 8% годовых (начисляется раз в год).

После первого года сумма на счету составила 240$. 

Какова была первоначальная сумма залога?
Задание №5
Миска на половину заполненна водой. 4 стакана воды были добавлены 

и заполнили миску на 70%.
Какое количество стаканов воды теперь в миске?
Задание №6
х равен 40% от y. 50% от у это 40.
Какой процент от х представляет значение 16?
Задание №7
800 увеличили на 50%, затем уменьшили на 30%.
Какое значение получилось?
Задание №8
Лори кладёт на счёт 10,000$ под 10% годовых (ежегодные начисления).

Спустя 3 года, какая сумма будет на счету у Лори?
Задание №9
Если 1,500 увеличить на 20%, затем уменьшить на у%, то получится 1,080.
Каково значение у?
Задание №10
Бутылка на 80% заполненна. Жидкость в бутылке на 60% состоит из

сока гуавы и 40% яблочного сока. Остаток бутылке затем заполняется

200мл рома.
Какой объем сока гуавы в бутылке?
GMAT -  Глава #1 - Дроби, десятичные числа и проценты - #3: Проценты

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GMAT - Глава #1 - Дроби, десятичные числа и проценты - #3: Проценты