Benefits program Prog1

#include<stdio.h>
#include<conio.h>
#include<ctype.h> //function variable=toupper(variable)
#include<stdlib.h> //function fflush(stdin) to make sure input overflow does not happen

void main()
{
    int hours;
    float rate, benefits, gross, tax;
    char plan, control;
    printf("Please enter the number of hours worked: ");
    scanf_s("%d", &hours);
    printf("Please enter the salary rate: ");
    scanf_s("%f", &rate);
    fflush(stdin);
    gross = (float)hours*rate;
    tax = gross*.1;
    printf("\nRetirement plan offers:");
    printf("\nS\tStandard Retirement Plan - %.2f(5%%) deducted from gross pay", gross*.05);
    printf("\nP\tPremium Retirement Plan - %.2f(8%%) deducted from gross pay", gross*.08);
    printf("\nN\tNo Retirement Plan");
    printf("\nPlease enter the letter of your choice: ");
    fflush(stdin);
    scanf_s(" %c", &plan);
    plan = toupper(plan);//this changes the character value to uppercase regardless of input
    if (plan == 'S') benefits = gross*.05;
    else if (plan == 'P') benefits = gross*.08;
    else if (plan == 'N') benefits = 0;
    else
    {
        printf("\nInvalid entry. No retirement plan selected. Proceeding.");
        benefits = 0;
    }
    printf("\nWould you like to add Medical insurance? (Php 1500)\nY/N :");
    fflush(stdin);
    scanf_s(" %c", &control);
    control = toupper(control);//this changes the character value to uppercase regardless of input
    if (control == 'Y') benefits = benefits + 1500;
    else if (control != 'N') printf("/nInvalid entry. Benefit not added to total.");
    printf("\nWould you like to add Life insurance? (Php 500)\nY/N :");
    fflush(stdin);
    scanf_s(" %c", &control);
    control = toupper(control);//this changes the character value to uppercase regardless of input
    if (control == 'Y') benefits = benefits + 500;
    else if (control != 'N') printf("/nInvalid entry. Benefit not added to total.");
    printf("\nWould you like to add Dental insurance? (Php 100)\nY/N :");
    fflush(stdin);
    scanf_s(" %c", &control);
    control = toupper(control);//this changes the character value to uppercase regardless of input
    if (control == 'Y') benefits = benefits + 100;
    else if (control != 'N') printf("/nInvalid entry. Benefit not added to total.");
    //input evaluation ends here, output next.
    printf("\nGross pay:\tPhp. %0.2f", gross);
    printf("\nTax deduction:\tPhp. %0.2f", tax);
    printf("\nTotal benefits:\tPhp. %0.2f", benefits);
    printf("\nNet pay:\tPhp. %.2f", gross - tax - benefits);
    printf("\n\nPress any key to end program.");
    _getch();

}