In this tutorial, we will write a program to find the Simple Interest in C. And the formula to calculate the Simple Interest (SI) is:

**SI = ((p * r * t) / 100)) **

where,

**p** = Principal

**r** = Rate of Interest

**t** = Time Period

**Explanation**:

The program takes the user input for Principal, Rate, and Time, calculates the result, and displays the result on the screen.

**C Program to calculate the Simple Interest**

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | //Program to calculate simple interest in C #include<stdio.h> #include<conio.h> int main() { float p, r, t; float SI; printf("Enter the principal: "); scanf("%f", &p); printf("Enter the rate: "); scanf("%f", &r); printf("Enter the time: "); scanf("%f", &t); //calculating SI = (p * r * t) / 100; //Display the result printf("\nThe simple interest is: %.3f", SI); return 0; } |

**Output:**

`Enter the principal: 34000 `

Enter the rate: 30

Enter the time: 5

The simple interest is: 51000.00

The above source code to calculate the Simple Interest in C is compiled and ran successfully on a windows system. Browse through **C Program** to learn more.