Howdy readers, today you will learn** how to write a program to calculate simple interest using C** Programming language.

**Simple interest** is a method to calculate the amount of interest charged on an amount at a given rate and for a given period of time.

Simple interest is calculated using the following formula:

**Simple Interest **= **(P x R x T) / 100**, where **P** is the principal amount, **R** is the rate of interest and **T** is the time period.

We will be using this formula in our program to compute simple interest.

So, without any delay, letâ€™s begin this tutorial.

**C Program to Calculate Simple Interest**

**C Program**

// C Program to Calculate Simple Interest #include <stdio.h> int main(){ float principal, rate, time, SI; // Asking for input printf("Enter the principal amount: "); scanf("%f", &principal); printf("Enter the rate of interest: "); scanf("%f", &rate); printf("Enter the time period: "); scanf("%f", &time); // Calculating simple interest SI = (principal * rate * time) / 100; // Displaying output printf("Simple Interest: %.2f", SI); return 0; }

**Output**

```
Enter the principal amount: 20000
Enter the rate of interest: 3
Enter the time period: 6
Simple Interest: 3600.00
```

**Explanation**

float principal, rate, time, SI;

In this program, we have declared four float data type variables named** principal**, **rate**, **time** and **SI**.

// Asking for input printf("Enter the principal amount: "); scanf("%f", &principal); printf("Enter the rate of interest: "); scanf("%f", &rate); printf("Enter the time period: "); scanf("%f", &time);

Then, the user is asked to enter the principal amount, rate of interest and time period.

// Calculating simple interest SI = (principal * rate * time) / 100;

We calculate the simple interest using the formula** SI = (PxRxT)/100**. The simple interest gets stored in the **SI **named variable.

// Displaying output printf("Simple Interest: %.2f", SI);

Finally, the simple interest is displayed on the screen using **printf()** function. Here, we have used **%.2f** format specifier because we want to display the result only till **2** decimal places.

**Conclusion**

I hope after reading this post, you understand **how to write a program to calculate simple interest using C** Programming language.

If you face any difficulty while understanding this program, then let us know in the comment section. We will be delighted to solve your query.

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