C program to calculate tax, given the following conditions

In this tutorial, we can learn C program to calculate tax. In this c program, we enter a number and calculate tax with the given following conditions.

1. if income is less thn, 1,50,000 then no tax
2. if taxable income is in the range 1,50,001-300,000 then charge 10% tax
3. if taxable income is in the range 3,00,001-500,000 then charge 20% tax
4. if taxable income is above 5,00,001 then charge 30% tax.

#include <Stdio.h> 
 #include <conio.h> 
 #define MIN_INCOME1 150001 
 #define MAX_INCOME1 300000 
 #define TAX_RATE1 0.10 
 #define MIN_INCOME2 300001 
 #define MAX_INCOME2 500000 
 #define TAX_RATE2 0.20 
 #define MIN_INCOME3 500001 
 #define TAX_RATE3 0.30 
 main()  { 
    double income, taxable_income,tax; 
    clrscr (); 
    printf("\n Enter the income: "); 
    scanf ("%lf", &income) ; 
    taxable_income = income - 150000; 
    if(taxable_income <= 0)  { 
       printf ("\n NO TAX"); 
   } 
   else if(taxable_income >= MIN_INCOME1 && taxable_income < MAX_INCOME1)  { 
       tax = (taxable_income - MIN_INCOME1) *TAX_RATE1; 
   } 
  else if(taxable_income >= MIN_INCOME2 && taxable_income < MAX_INCOME2) { 
    tax = (taxable_income - MIN_INCOME2) * TAX_RATE2; 
  } 
 else  { 
    tax = (taxable_income - MIN_INCOME3) * TAX_RATE3; 
    printf("\n TAX= %lf", tax); 
  } 
  getch(); 
  return 0; 
 }