Write a C program to input principle, 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

Arithmetic operators, Variables and expressions, Data types, Basic input/output

## 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`. - Find simple interest using formula
`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;
/* Print the resultant value of SI */
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 😉

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