Maintenance Cost and Operational Cost

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 50
#define LIMIT 50
int a[N],b[N],c[N],i,t,f=0,count=0,sum=0;
double mo;
void main()
{
	srand((unsigned int)time(0));
    for(i=0;i<N;i++)
    a[i]=rand()%100;
    for(i=0;i<N;i++)
    b[i]=(rand()%200);
    for(i=0;i<N;i++)
    printf("%d    %d\n",a[i],b[i]);
    printf("\n\n");
    for(i=0;i<N;i++)
    sum=sum+a[i];
    mo=(sum*1.0)/(N*1.0);
    printf("the mean value is %5.5lf\n\n",mo);
    for(i=0;i<N;i++)
    if(b[i]<LIMIT)
    count++;
    printf("the number of the weeks above this limit is %d\n",count);
    printf("\n\n");
    for(i=0;i<N;i++)
    if(b[i]<LIMIT)
    {
    	c[f]=(i+1);
        f++;
    }
    for(t=0;t<f;t++)
    printf("%d\n",c[t]);
    printf("\n");
    printf("Limit=%d\n",LIMIT);
}