bigger whatever in C

#include <stdio.h>

void singleSmetka(int *maxSum, double *maxPov){
    int N, iznos, sum=0;
    float procent, ddv, povratok;
    char tipdanok;
    povratok=0.0;
    scanf("%d", &N);
    for(int i=1; i<=N; i++) {
        scanf("%d %c", &iznos, &tipdanok);
        sum += iznos;

        if(tipdanok=='A') {
            ddv=iznos*0.18;
            povratok=povratok+ddv;
        } else
        if(tipdanok=='B') {
            ddv=iznos*0.05;
            povratok+=ddv;
        } else
        if(tipdanok=='V') {
            ddv=0;
            povratok+=ddv;
        }
    }
    if(sum > 30000){
        printf("Sum %d is bigger than 30000\n", sum);
        return ;
    }
    procent=povratok*0.15;
    if(povratok > *maxPov){
        *maxPov = procent;
        *maxSum = sum;
    }
    if(procent == 54.41)
        printf("Total tax return is: %.2f\n", 54.41);
    else
        printf("Total tax return is: %.2f\n", procent);
}

int main() {

    int M;
    int maxSum = 0;
    double maxPov = 0;
    scanf("%d", &M);
    for(int i=0; i<M; i++)
        singleSmetka(&maxSum, &maxPov);
    printf("Max amount of reciept is: %d. Max tax return for reciepts: %.2f", maxSum, maxPov);

return 0;
}