Decision Making and Branching

A cloth showroom has announced the following seasonal discounts on purchase of items:
Purchase                                               Discount
amount                              Mill cloth                   Handloom items
      0 - 100                                  -                                       5%
  101 - 200                                5%                                  7.5%
  201 - 300                              7.5%                                10.0%
Above 300                            10.0%                                15.0%
Write a program using switch and if statements to compute the net amount to be paid  by customer.

#include <stdio.h>
void main()
{
int choose, p_amt,pay,discount;
clrscr();
printf("Enter your catagory 1 for mill cloth\n2 for Handloom items and\
 purchase amount");
printf("\n0 for End:");
input:
scanf("%d %d",&choose,&p_amt);
if(choose==0)
goto end;
switch(choose)
{
case 1: if(p_amt<=100)
 discount=0;
 else if(p_amt<=200)
 discount=p_amt*0.05;
 else
 if(p_amt<=300)
 discount=p_amt*0.075;
 else
 if(p_amt>300)
 discount=p_amt*0.10;
 break;
case 2: if(p_amt<=100)
 discount=p_amt*0.05;
 else if(p_amt<=200)
 discount=p_amt*0.075;
 else
 if(p_amt<=300)
 discount=p_amt*0.10;
 else
 if(p_amt>300)
 discount=p_amt*0.15;
 break;
 default: printf("Error in choise");
 goto end;
 }
pay=p_amt-discount;
printf("You have to pay %d",pay);
goto input;
end:
printf("End of Program!");
getch();
}