Question

3. Find the time period if:
(i) principal = x, amount = 3x and rate of interest = 8% per annum
(ii) principal = 50,000, amount = 62,000 and rate of interest = 85 % per annum
(iii) principal = 100, amount = 106 and rate of interest = 12% per annum
(iv) principal = 4000, simple interest = *550 and rate of interest = 5% per annum
(v) principal = 800, amount = *992 and rate of interest = 8% per annum​

Answer 1

Answer:

Simple Interest, S.I. = Rs. 1260 =

100

PR×2

=

50

PR

-(i)

Compound Interest, C.I. = Amount(A) - Principle(P)

=P(1+

100

R

)

2

- P = PR(R/10000+1/50)=Rs.1323 -(ii)

Dividing (ii) by (I),

200

R

+1 =

1260

1323

⇒Rate,R=10%p.a.

Now,

100

PRT

=1260

⇒

100

P×10×2

=1260

⇒ Principal or Sum , P = Rs.6,300