C :

#include <math.h>
#include "stdio.h"
 
 
int main() {
    float p;
    scanf("%f", &p);
    float price;
    if (p < 100) {
        price = p;
    } else if (p < 200) {
        price = p * (1 - 0.05);
    } else if (p < 500) {
        price = p * (1 - 0.08);
    } else if (p < 1000) {
        price = p * (1 - 0.1);
    }else{
        price = p * (1 - 0.15);
    }
    printf("price = %.1f\n", price);
    return 0;
}