//variables which set the price of the tickets
            float priceYears5To15 = 2.99F;
            float priceYears16To65 = 5.99F;

            //calucalate total price for children tickets
            float priceTotalChild = priceYears5To15 * float.Parse(amountChild115.Text);
            float priceTotalAdult = priceYears16To65 * float.Parse(amountAdult1665.Text);

            //total price for all tickets
            float priceTotal = priceYears5To15 + priceYears16To65;