C Program to Calculate Compound Interest.

Compound Interest (CI) = P * (1 + R/n)^(n*T) - P

Given Data:

Principal amount (P) = 10,000 rupees
Annual interest rate (R) = 5% (or 0.05 as a decimal)
Time duration (T) = 3 years
Number of times interest is compounded per year (n) = 1 

Solution: 
CI = 10000 * (1 + 0.05/1)^(1*3) - 10000
   = 10000 * (1.05)^3 - 10000
   = 10000 * 1.157625 - 10000
   = 11576.25 - 10000
   = 1576.25 rupees

// C program to calculate compound interest  
#include <stdio.h>
#include <math.h>

int main() {
    float principal, rate, time, compoundInterest;
    int n;

    // Input the principal amount
    printf("Enter the principal amount: ");
    scanf("%f", &principal);

    // Input the annual interest rate (as a decimal)
    printf("Enter the annual interest rate (as a decimal): ");
    scanf("%f", &rate);

    // Input the time duration in years
    printf("Enter the time duration in years: ");
    scanf("%f", &time);

    // Input the number of times interest is compounded per year
    printf("Enter the number of times interest is compounded per year: ");
    scanf("%d", &n);

    // Calculate the compound interest
    compoundInterest = principal * pow(1 + rate / n, n * time) - principal;

    // Display the calculated compound interest
    printf("Compound Interest: %.2f\n", compoundInterest);

    return 0;
}

Enter the principal amount: 10000
Enter the annual interest rate (as a decimal): 0.05
Enter the time duration in years: 5
Enter the number of times interest is compounded per year: 1
Compound Interest: 2762.81