C programming help

#include <stdio.h>
#include <stdlib.h>

int main()
{
    double weight, miles, rate370;

    printf("How heavy is the package in pounds . \n");
    scanf("%lf", &weight);
    printf("The package weighs : %.2lf \n", weight);

    printf("How many miles are you shipping the package .\n");
    scanf("%lf", &miles);
    printf("You are shipping the package %.2lf \n", miles);

    if ( weight <= 5.6 )
    {
        rate370 = (int) miles / 500 * 3.7;
        printf("Your total cost : %.2lf\n", rate370);

    }



}