Question

Положили в банк деньги под 10% годовых. какую сумму положили если известно что через 3 года на счету было 11979 рублей.

Answer 1

10% от 11979руб. 1197,9

за три года  1197,9 х 3=3593,7 это% за три года

11979-3593,7= 8 тысяч 382руб 30 копеек

1

Answer 2

Calculation of the Initial Deposit Amount

To calculate the initial deposit amount, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where: - A is the final amount after t years - P is the principal amount (initial deposit) - r is the annual interest rate (10% or 0.1) - n is the number of times interest is compounded per year (assuming it is compounded annually, n = 1) - t is the number of years (3 years)

We know that after 3 years, the account balance was 11,979 rubles. Let's substitute the values into the formula and solve for P:

11,979 = P(1 + 0.1/1)^(1*3)

Simplifying the equation:

11,979 = P(1.1)^3

Dividing both sides by (1.1)^3:

P = 11,979 / (1.1)^3

Using a calculator, we can find that P is approximately 9,000. Therefore, the initial deposit amount was approximately 9,000 rubles.

Please note that the actual value may vary slightly due to rounding or compounding frequency assumptions.