What are the errors in this C program for calculating simple interest, and how can they be fixed?

The main issue is a consistent misspelling of the variable principal.

1. Incorrect variable name in scanf for principal: You declared the variable as float principal; but then tried to read input into &principalAmt in the scanf function. The variable principalAmt is not declared. It should be &principal.

   Original:
   scanf("%f", &principalAmt);
   Corrected:
   scanf("%f", &principal);

2. Incorrect variable name in simple interest calculation: Similarly, in the calculation for SI, you used principleAmt instead of principal.

   Original:
   SI = (principleAmt * time * rate) / 100;
   Corrected:
   SI = (principal * time * rate) / 100;

Here is the corrected code:

#include<stdio.h>

int main() {
    float principal;
    float rate;
    float time;
    float SI;

    printf("ENTER THE PRINCIPLE AMT\n");
    scanf("%f", &principal); // Corrected: used 'principal'
    printf("ENTER THE RATE\n");
    scanf("%f", &rate);
    printf("ENTER THE TIME\n");
    scanf("%f", &time);

    //calculate the simple interest
    SI = (principal * time * rate) / 100; // Corrected: used 'principal'

    //display the calculated interest to the user
    printf("INTEREST:%f\n", SI);

    return 0;
}