#include <stdio.h>

main()
{
   int day;
   float price, percentage, taken, limit;

   printf("\nEnter original price of item: ");
   scanf("%f", &price);
   printf("Enter percentage reduction per day: ");
   scanf("%f", &percentage);
   day = 0;
   limit = price / 2;
   while (price >= limit)
   {
      taken = price / 100 * percentage;
      price -= taken;
      day++;
   }
   printf("\nIt took %d days for the item to go below half price!\n", day);
}