Question

34. John invested a sum of money at
an annual simple interest rate of
10%. At the end of four years the
amount invested plus interest
earned was 770. The amount
invested was​

Answer 1

please mark it as brainlylest

Answer 2

Answer:

The amount invented was Rs.550.

Given:

John invested a sum of money at an annual simple interest rate of 10%. At the end of four years the amount invested plus interest earned was 770.  

To find:

The amount invested  

Solution:

SI = $\frac{P\timesN\timesR}{100}$

Let x be the Principal amount

n = 4, r = 10%

$\frac{x \times 4 \times 10}{100}$=770-x

$\frac{2 x}{5}$ =770-x

2x = 3850 - 5x

7x = 3850

x = Rs.550 = Principal

Result:

The amount invented was Rs.550.