Hey guys, what’s up? My last tutorial was about Calculate circumference, area and perimeter in C. Here is a quick program which shows how to calculate simple interest in C. You can try it using Turbo C & check it out. This is the a problem from Chapter 1: Getting Started of the book, “Let us C” by “Yashwant Kanetkar”. Do let us know if you have any doubts or suggestions in the comments section below.

## Question

The principal amount, number of years & rate of interest is 2000, 4 & 4 respectively. The formula for calculating interest is p*n*r / 100. Find Simple Interest using C Program.

## Solution to Calculate Simple Interest in C Programming

First, you need to declare four variables for amount, number of years, rate & interest. Here, we are gonna name the variables p for Principal, n for number of years, r for the rate of interest and si for Simple Interest. Next we assign the values to our three variables, p, n and r. Use the formula p*n*r/100 and store the result in the variable for interest i.e si. Lastly, display the calculated simple interest using the prinf() function.

## Source Code

```#include<stdio.h>
#include<conio.h>
void main()
{
int p,n,r,si;
clrscr();
p=2000; //principal amount
n=4; //number of years
r=4; // rate of interest
si= p*n*r/100; //formula
printf("Simple interest is %d",si);
getch();
}```

### Output

Simple interest is 320

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