Question

What is the rate of simple interst for 4 years if the sum of 360 become 540 in 9 years and the rate of interest for the last 5 years in 6%

Answer 1

Let Age of

Father = x

Mother = y

son = Z

(X + Z) / 2 = 25

=》x+z = 50

(x+y)/2 = 40

=》x+y = 80

=》y = 80-x ----- (i)

(y+z) /2 = 24

=》 y+z = 48

Answer 2

SOLUTION

Interest for the last 5 years

$= > \frac{PRT}{100} \\ = > \frac{360 \times 5 \times 6}{100} = rs.108$

Interest for year= (540-360)Rs.

=) 180Rs.

So, interest for first four years

=) (180-108)Rs.

=) Rs. 72

Now, rate for first four years

$= > \frac{(72 \times 100)}{360 \times 4} \\ \\ = > ( \frac{72 \times 25}{360} ) \\ \\ = > \frac{25}{5} = 5\%$

hope it helps ☺️