To represent the reduced price of the computer after a 13% price reduction, we can follow these steps:

1. Original Price Representation: Let $x$ represent the original price of the computer.
2. Price Reduction Calculation: A 13% reduction means the consumer pays 87% of the original price (because $100\% - 13\% = 87\%$).
3. Reduced Price Representation: To find the reduced price, we multiply the original price by 87%, which can be written as $0.87$ in decimal form.

Therefore, the reduced price $P$ can be represented by:

$P = 0.87x$

This equation shows that the reduced price is 87% of the original price $x$.

Would you like more details or have any questions? Here are some related questions to explore further:

1. If the original price of the computer was $500, what is the reduced price after a 13% discount?
2. How would the reduced price change if the discount were 20% instead of 13%?
3. What is the percentage discount if the reduced price is $435 and the original price was $500?
4. How do you express a 13% increase in price mathematically?
5. How can you calculate the original price given the reduced price and the percentage discount?

Tip: When dealing with percentage changes, converting percentages to decimals makes calculations easier and less error-prone.