Final answer:
To find the selling price when the profit percentage is given, use the formula Selling Price = Cost Price + (Profit Percentage x Cost Price). To find the cost price when the profit or loss percentage is given, use the formula Cost Price = Selling Price / (1 + (Profit/Loss Percentage / 100)).
Step-by-step explanation:
Selling Price Formula:
The formula to calculate the selling price when the profit percentage is given is:
Selling Price = Cost Price + (Profit Percentage x Cost Price)
For example, if the cost price is $100 and the profit percentage is 20%, the selling price would be:
Selling Price = 100 + (0.20 x 100) = $120
Cost Price Formula:
The formula to calculate the cost price when the profit or loss percentage is given is:
Cost Price = Selling Price / (1 + (Profit/Loss Percentage / 100))
For example, if the selling price is $120 and the profit percentage is 20%, the cost price would be:
Cost Price = 120 / (1 + (20 / 100)) = $100