tax calculation

Q WAP to input monthly salary from the user and calculate the income tax according to the following rules:

                        Salary                                      income tax

                        >=9000                                    40% of the salary

                        7500-8999                               30% of the salary

                        <7500                                      20% of the salary

#include<stdio.h>
#include<conio.h>
void main()
{float sal,tax;
printf("enter sal");
scanf("%f",&sal);
if (sal<7500)
tax=(sal*0.20);
else if (sal>=7500&&sal<9000)
tax=(sal-7499)*0.30+7499*0.20;
else if (sal>9000)
tax=(sal-8999)*0.40+1500*0.30+7499*0.20;
printf("total tax: %f",tax);
getch();
}