Question

A shopkeeper purchased one dozen pens for $₹108$ and sold these at $₹12.50$each. Find:

1. cost of one pen.
2. profit or loss on selling pen.
3. his total profit or loss on selling all pens.

Answer 1

1. The cost price of $12$ pens $=₹108$

So, the cost price of one pen $=\frac{₹108}{12}=₹9$.

Thus, the cost price of one pen $=₹9$.

2. the selling price of one pen $=₹12.50$

Since the selling price of a pen is more than the cost price, then, there is a profit.

Profit $=$ selling price $-$ cost price

Profit on selling one pen $=₹12.50-₹9=₹3.50$

Thus, profit on selling one pen $=₹3.50$.

3. The cost price of $12$ pens $=₹108$

the selling price of $12$ pens$=12\times ₹12.50=₹150$

Total profit on selling all pens $=₹150-₹108=₹42$

Hence, the total profit on selling all pens$=₹42$.