Question

В банке был открыт счёт на 8000 руб. сроком на 1 год. Через год сумма на счёте стала равна 8640 руб. Сколько процентов от вложенной суммы составляет новая сумма на счёте ?

Answer 1

1) 8640-8000=640(р)-накоплённые деньги
2)8000/100=80(р)-  1%
3)640/80=8%-новая сумма на счете

Answer 2

Calculation of Interest Rate

To calculate the interest rate, we need to find the percentage increase in the account balance over the course of one year.

The initial account balance was 8000 rubles, and after one year, it increased to 8640 rubles.

To find the percentage increase, we can use the following formula:

Percentage Increase = ((New Amount - Initial Amount) / Initial Amount) * 100

Substituting the values, we get:

Percentage Increase = ((8640 - 8000) / 8000) * 100

Calculating the numerator and denominator:

Percentage Increase = (640 / 8000) * 100

Simplifying the fraction:

Percentage Increase = 0.08 * 100

Calculating the percentage:

Percentage Increase = 8%

Therefore, the new amount on the account represents an 8% increase over the initial amount.