Fix Code to Match Intended Output

At Zebra Technologies, a warehouse handheld scanner logs how many barcode scans happen during a shift. A firmware engineer wrote the tally routine below in C, and it is producing numbers that don't match what the QA team observes on the device.

#include <stdio.h>

#define NUM_BATCHES 5

int main(void) {
    /* index 5 is a leftover test value from bring-up, not a real batch */
    int batch_counts[NUM_BATCHES + 1] = {68, 55, 72, 60, 64, 95};
    unsigned char total_scans = 0;
    int highest_count = 0;
    int highest_batch = 0;
    int i;

    for (i = 0; i <= NUM_BATCHES; i++) {
        total_scans += batch_counts[i];
        if (batch_counts[i] > highest_count) {
            highest_count = batch_counts[i];
            highest_batch = i;
        }
    }

    int scans_per_hour = (total_scans / 8) * 60;

    printf("Total scans this shift: %d
", total_scans);
    printf("Busiest batch: %d with %d scans
", highest_batch, highest_count);
    printf("Scan rate: %d per hour
", scans_per_hour);

    return 0;
}

Trace this program by hand and give the exact three lines it prints. Then explain how you would change it so it reports the real 5-batch shift correctly.