Final answer:
The shopkeeper made a profit of Rs. 60 by buying 5 dozen pencils for Rs. 300 and selling them at Rs. 6 each, for a total revenue of Rs. 360. This indicates there's a discrepancy in the provided answer choices.
Step-by-step explanation:
To find the shopkeeper's profit or loss, we need to calculate the total cost and the total revenue, then subtract the cost from the revenue. The shopkeeper bought 5 dozen pencils for Rs. 300. Since one dozen equals 12 pencils, 5 dozen pencils are 5 × 12, which is 60 pencils. The shopkeeper sold each pencil for Rs. 6. So, the total revenue from selling all pencils is 60 × Rs. 6, which equals Rs. 360.
Now, let's calculate the profit or loss using the following formula: Profit/Loss = Total Revenue - Total Cost.
Total Revenue = Rs. 360
Total Cost = Rs. 300
Profit/Loss = Rs. 360 - Rs. 300 = Rs. 60.
Since the result is positive, the shopkeeper made a profit. Therefore, the answer to the question is a) Profit of Rs. 60, which is not listed in the options provided. This could be a typo or error in the provided options.