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Cost of Exercise Books Word Problem: Unit Price Calculation
Published on July 22, 2026
Word-Problem
Learn how to calculate the cost of 8 exercise books when 10 books cost 800 naira by finding the unit price first. This word problem demonstrates basic proportion.
Question
if 10 exercise books cost 800 naira find the cost of 8 exercise books
Answer
To find the cost of 8 exercise books, we can follow these steps:
Step 1: Find the cost of one exercise book (the unit price).
Since 10 exercise books cost 800 naira, we divide the total cost by the number of books:
Since 10 exercise books cost 800 naira, we divide the total cost by the number of books:
Step 2: Find the cost of 8 exercise books.
Now that we know one book costs 80 naira, we multiply this unit price by 8:
Now that we know one book costs 80 naira, we multiply this unit price by 8:
Final Answer:
The cost of 8 exercise books is 640 naira.
The cost of 8 exercise books is 640 naira.