Question

at what rate of interest will a sum of Rs 18000 will become an amount of Rs 25000 after 5 years

Answer 1

Hey

Given :-

♦ Principal :- Rs 18000

♦ Amount :- Rs 25000

♦ Time :- 5 years .

Solution :-

SI = Amount - principal

SI = Rs ( 25000 - 18000 )

SI = Rs 7000


Now ,

SI = P * r * t / 100

=> 18000 * r * 5 / 100 = 7000

=> 180 * 5 * r = 7000

=> 180 * r = 1400

=> r = 1400 / 180

=> r = 140 / 18

=> r = 70 / 9

=> r = 7 . 7

So ,

rate = 7.7 %


thanks :)

Answer 2

SI = P x R x T/100
R= (SI x 100)/(P x T)
SI= Amount - P
=25000-18000=Rs 7000
R= (7000 x 100)/(18000 x 5)
R= 70/9%
$r = 7 + \frac{7}{9}$

Hope this helps you