Write a C program to input principle (amount), time and rate (P, T, R) from user and find Simple Interest. How to calculate simple interest in C programming. Logic to find simple interest in C program.

**Example**

**Input**

Enter principle: 1200 Enter time: 2 Enter rate: 5.4

**Output**

Simple Interest = 129.600006

## Required knowledge

Fundamentals of C, Data types, Talking user input in C

## Simple Interest formula

Simple interest formula is given by.

Where,

P is the principle amount

T is the time and

R is the rate

## Logic to calculate simple interest

Step by step descriptive logic to calculate simple interest.

- Input principle amount in some variable say principle.
- Input time in some variable say time.
- Input rate in some variable say rate.
- Apply formula to calculate simple interest i.e. SI = (principle * time * rate) / 100.
- Finally, print the resultant value of SI.

## Program to calculate simple interest

```
/**
* C program to calculate simple interest
*/
#include <stdio.h>
int main()
{
float principle, time, rate, SI;
// Input principle, rate and time
printf("Enter principle (amount): ");
scanf("%f", &principle);
printf("Enter time: ");
scanf("%f", &time);
printf("Enter rate: ");
scanf("%f", &rate);
// Calculate simple interest
SI = (principle * time * rate) / 100;
printf("Simple Interest = %f", SI);
return 0;
}
```

Output

Enter principle (amount): 1200 Enter time: 2 Enter rate: 5.4 Simple Interest = 129.600006

Happy coding 😉

<pre><code> ----Your Source Code---- </code></pre>