Working with percentages in C

/**
 * A quick demonstration of working out percentages using C
 * will probably work on all other problem-orientated languages.
 * Written with Code::Blocks, tested on Windows 7 and cmd.exe
 *
 * @Author:     Shaun B
 * @Version:    1.0.1 - 2013-06-14
 * @Todo:       Look into floating point guides and why
 *              there are rounding errors
 *
 **/

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

/// Function prototypes:
int main();
float percent (float pc);
float taxToAdd (float number, float percent);

/// Variables:
float taxRate   = 20.00f;     // ie VAT, PAYE etc...
float percentage = 0.00f;
float taxToPay  = 0.00f;
float priceWithTax = 0.00f;

int main()
{
    float originalPrice = 59.99f;
    unsigned char pound = 156;

    percentage   = percent (taxRate);
    taxToPay    = taxToAdd (originalPrice, percentage);
    priceWithTax = originalPrice + taxToPay;

    printf("Tax rate set to: %.2f\%%\n", taxRate);
    printf("Original price of goods less tax: %c%.2f\n", pound, originalPrice);
    printf("Tax on goods: %c%.2f\n", pound, taxToPay);
    printf("Total payable: %c%.2f\n", pound, priceWithTax);

    printf("Fin. Press any key.");
    _getch();

    return 0;
}

float percent (float pc)
{
    return (float)pc/100.00f;
}

float taxToAdd (float price, float percent)
{
    return (float)price*percent;
}