output is wrong if i am putting value of principal=100, rate = 4, year=1 then simple interest will be 4

you need to calculate the simple interest after the principle, rate and year are populated

#include <stdio.h>

int main()
{
float principle;
float rate;
float year;
// float si = (principle*rate*year)/100; //wrong . you need to calculate after the principle, rate and year are populated
float si;
    printf("what is the principal amount\n");
    scanf("%f", &principle);
    printf("what is the rate\n");
    scanf("%f", &rate);
    printf(" and for how many years\n");
    scanf("%f", &year);
    si = (principle*rate*year)/100;
    printf("Then si is %f", si);
    return 0;

}