Final answer:
To calculate the cost of three pens when 10 pens cost 1080 naira, we find the price per pen by dividing 1080 naira by 10. We then multiplied the price per pen by three, resulting in 324 naira for three pens.
Step-by-step explanation:
If 10 pens cost 1080 naira, finding the cost of three pens involves a simple proportion calculation. To find out the cost of one pen, we divide the total cost by the number of pens: 1080 naira ÷ 10 pens.
This gives us the cost of one pen. Then we multiply the cost of one pen by the number of pens we are interested in, which is three in this case.
Let's calculate it step by step:
- Determine the cost of one pen: 1080 naira ÷ 10 pens = 108 naira per pen.
- Calculate the cost for three pens: 108 naira per pen × 3 pens = 324 naira for three pens.
Therefore, the cost for three pens would be 324 naira.