Question

Swamini borrowed an amount of Rs. 70000 at the rate of 14 p.c.p.a from a bank. How much amount should she return at the end of the year/ ​

Answer 1

Answer:5% p.a

Step-by-step explanation:

Let the rate of interest =R%p.a.

In the first 3yrs,

principal =P=Rs7000, Time T=3yrs.

Then the interest =I  

1

​

=  

100

PRT

​

=  

100

7000×R×3

​

=210R.

In the next (5-3)yrs=2yrs,

Pricipal =P=RS(7000−3000)=RS4000, Time =T=2yrs.

Then, the interest=I  

2

​

=  

100

PRT

​

=  

100

4000×R×2

​

=80R.  

∴ the total amount returned this time

=Rs(4000+I  

1

​

+I  

2

​

)=Rs5450

⟹4000+210R+80R=5450

⟹29R=1450

⟹R=5p.c.p.a.

So the rate of interest=5% p.a

Answer 2

Answer:

please comment me my answer

Step-by-step explanation:

Let the rate of interest =R%p.a.

In the first 3yrs,

principal =P=Rs7000, Time T=3yrs.

Then the interest =I

1

=

100

PRT

=

100

7000×R×3

=210R.

In the next (5-3)yrs=2yrs,

Pricipal =P=RS(7000−3000)=RS4000, Time =T=2yrs.

Then, the interest=I

2

=

100

PRT

=

100

4000×R×2

=80R.

∴ the total amount returned this time

no

=Rs(4000+I

1

+I

2

)=Rs5450

⟹4000+210R+80R=5450

⟹29R=1450

⟹R=5p.c.p.a.

So the rate of inte rest=5% p.a.