Tax

#include <stdio.h>
#include <stdlib.h>
int main(void) {
  FILE *in = fopen("file1.txt", "r");
  FILE *out = fopen("file2.txt", "w");
  char buf[BUFSIZ];
  int n, price;
  fgets(buf, BUFSIZ, in); // ignore header
  while (~scanf("%d %d", &n, &price))
    fprintf(out, "%d\n", (int) (n * price * 1.05));
  fclose(in);
  fclose(out);
  return 0;
}