Mathematical point of view for simple interest. Click on the link to Watch the VIDEO explanation: Watch Video
Numerical example
Rs. 890 becomes Rs. 1068 in 4 years at a certain rate of simple interest. What amount will become Rs. 1620 in 7 years at the same rate of interest?
Identify the data given to you by clicking on the right links.
We are given that Principal P is equal to Rs. 890, Amount A is equal to 1068 and Time T is equal to 4 years
How do you proceed? Which of these would you calculate first click on the correct link.
Select the right formula for calculating the Simple Interest.
Simple Interest = Amount - Principal. Calculate and key in the right value in the text box. Click on CHECK to verify.
Now, we need to find the rate of interest. Select the right formula form the given choices.
R = 100 * SI by P*T. Calculate the value of R and key in your answer. Click on CHECK to verify to verify your answer.
Now we have found that if the Amount = Rs. 1620.
Time = 7 years and
Rate = 5%.
Next, we find the Principal which become Rs. 1620.
Simple Interest is expressed in terms of Principal by the formula
SI = P*R*T by 100. Here, Si is equal to P*5*7 by 100 which is equal to 7P by 20.
Also, we know that,
Principal plus SI = Amount i.e. P + 7P = 1620.
Calculate P and key in your answer. Click CHECK to verify.
Therefore, the sum is Rs. 1200.
Numerical example
Rs. 890 becomes Rs. 1068 in 4 years at a certain rate of simple interest. What amount will become Rs. 1620 in 7 years at the same rate of interest?
Identify the data given to you by clicking on the right links.
We are given that Principal P is equal to Rs. 890, Amount A is equal to 1068 and Time T is equal to 4 years
How do you proceed? Which of these would you calculate first click on the correct link.
Select the right formula for calculating the Simple Interest.
Simple Interest = Amount - Principal. Calculate and key in the right value in the text box. Click on CHECK to verify.
Now, we need to find the rate of interest. Select the right formula form the given choices.
R = 100 * SI by P*T. Calculate the value of R and key in your answer. Click on CHECK to verify to verify your answer.
Now we have found that if the Amount = Rs. 1620.
Time = 7 years and
Rate = 5%.
Next, we find the Principal which become Rs. 1620.
Simple Interest is expressed in terms of Principal by the formula
SI = P*R*T by 100. Here, Si is equal to P*5*7 by 100 which is equal to 7P by 20.
Also, we know that,
Principal plus SI = Amount i.e. P + 7P = 1620.
Calculate P and key in your answer. Click CHECK to verify.
Therefore, the sum is Rs. 1200.
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