Question

A certain money was invested which amounted to 9000 at 4% per annum simple interest
in 3 years. What will it amount in 6 years at 10% per annum simple interest?​

Answer 1

Answer :

• SI = Rs 5400
• Amount = Rs 30400

Given :

• Amount on Rs 9000
• For 6 years
• At 10% per annum.

To do :

• Calculation of the Simple Interest.

We will :

• Do this using Formula, their are one more method called unitary method in which we can get the answer but using Formula clear the concept very easily.

Solution :

( R ) Rate of interest = 10%

( P ) Principal = Rs 9000

( T ) Time = 6 years

$\begin{gathered}\begin{gathered} \rm \therefore \: Simple \: Interest \: (SI) = \dfrac{ \: P \: \times R \: \times \: T \: }{100} \\\\ = \dfrac{9000 \times 10 \times 6}{100} \\ \\ \large\bf=5400\end{gathered}\end{gathered}$

Therefore, Amount = Principal + Interest

= 25000 + 5400

= 30400

Therefore,

Simple Interest = Rs 5400

Amount = Rs 30400 is the amount in 6 years at 10% per annum simple interest.