# Write a Program in C, C++ and in Python to Calculate Simple Interest

Posted in  Vinay Khatri
Last updated on December 11, 2022

Here we have provided two programs that calculate the simple interest when the user provides the principal, rate, and time. So let's write a Program to Calculate Simple Interest. To calculate the simple interest, we have used this formula:

## Program to Calculate Simple Interest

SI = (p*r*t) / 100 SI = Simple interest p = principal r = rate t = time in years

### C++ Program to Calculate Simple Interest

``````#include<iostream.h>
#include< conio.h>

void main()
{
clrscr();
float SI, p,r,t;
cout<<"Enter Principal: ";
cin>>p;
cout<<"Enter rate: ";
cin>>r;
cout<<"Enter Time: ";
cin>>t;
SI = (p*r*t)/100;
cout<<"The SI is:"<<SI;
getch();
}``````

Output:

``````Enter Principal: 30000
Enter rate: 2
Enter Time: 4
The SI is: 2400.0``````

### Python Program to Calculate Simple Interest

``````p= float(input("Enter Principal: "))
r= float(input("Enter rate: "))
t= float(input("Enter Time: "))
SI = (p*r*t)/100
print("The SI is:",SI)``````

Output

``````Enter Principal: 30000
Enter rate: 2
Enter Time: 4
The SI is: 2400.0``````