First, let's break down the problem and calculate the necessary values step by step.

1. Find the discounted price:

The original price of the laptop is $900, and the discount is 10%. To find the discounted price:

$\text{Discount amount} = 900 \times \frac{10}{100} = 90$

$\text{Discounted Price} = 900 - 90 = 810$

So, the discounted price (selling price) is $810.

2. Find the profit:

The cost price of the laptop is $700, and the selling price is now $810. The profit is the difference between the selling price and the cost price:

$\text{Profit} = 810 - 700 = 110$

3. Calculate the profit percentage:

The profit percentage is calculated based on the cost price:

$\text{Profit percentage} = \left(\frac{\text{Profit}}{\text{Cost Price}}\right) \times 100 = \left(\frac{110}{700}\right) \times 100 \approx 15.71\%$

Thus, the profit percentage based on the discounted selling price is 15.71%.

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Would you like more details or have any further questions? Here are 5 related questions you might find useful:

1. What would the profit percentage be if there was no discount?
2. How would the profit percentage change if the discount was 20%?
3. If the store had a target profit percentage, how could they adjust the discount?
4. What would the final price be if a sales tax of 8% is added to the discounted price?
5. How can we determine the break-even price for the store?

Tip: Always calculate percentages based on cost price when determining profit or loss percentages, unless specified otherwise.