Final answer:
To find the original price of a book that is now priced at $6.30 after a 30% discount, divide $6.30 by 0.7. The result is $9.00, which indicates that the original price of the book was $9.00.
Step-by-step explanation:
To calculate the original price of the books before the 30% sale, we need to work backwards from the sale price to determine the full price. Since the books are on sale for $6.30 after the 30% discount, this means that $6.30 represents 70% of the original price. To find the original price, we'll divide the sale price by 0.7 (the decimal form of 70%).
Here's the step-by-step calculation:
- Write down the sale price: $6.30.
- Convert the percentage of the sale to a decimal to reflect the remaining percentage of the price paid: 100% - 30% = 70%, which converts to 0.7.
- Divide the sale price by the decimal: $6.30 / 0.7 = $9.00.
Therefore, the original price of the 'Diary of a Wimpy Kid' books was $9.00 each before the sale.