<PRE><B>Question 1174403</B>
**1. The Cellphone Company**

**A. Regular Selling Price**

* Let `x` be the regular selling price.
* Expenses = 0.17x
* Profit = 0.20x
* Cost = PhP24,000

We can set up an equation to represent the selling price:

Cost + Expenses + Profit = Selling Price
24000 + 0.17x + 0.20x = x
24000 = x - 0.17x - 0.20x
24000 = 0.63x
x = 24000 / 0.63
x ≈ PhP38,095.24

**Therefore, the regular selling price of the iPhone is PhP38,095.24.**

**B. Sale Price**

* Discount = 10% of PhP38,095.24 = PhP3,809.52
* Sale Price = PhP38,095.24 - PhP3,809.52 = PhP34,285.72

**Therefore, the sale price of the iPhone is PhP34,285.72.**

**C. Gain or Loss during Weekend Sale**

* Sale Price = PhP34,285.72
* Cost = PhP24,000
* Expenses = 0.17 * PhP34,285.72 = PhP5,828.57

Profit/Loss = Sale Price - Cost - Expenses 
              = PhP34,285.72 - PhP24,000 - PhP5,828.57
              = PhP4,457.15

**Therefore, The Cellphone Company gained PhP4,457.15 during the weekend sale.**


**2. Appliance Store**

* Mark-up = PhP3,450
* Mark-up percentage = 40% of selling price

Let `x` be the selling price of the TV set.

Mark-up = Mark-up percentage * Selling Price
PhP3,450 = 0.40x
x = PhP3,450 / 0.40
x = PhP8,625

**Therefore, the selling price of the TV set is PhP8,625.**</PRE>