A pen was sold for Rs.166.44 with a profit of 14%. If it were sold for Rs.154.76, then what would have been the percentage of profit or loss?

6% profit

Profit of 14% on cost price means 114% of the cost price

If,114% of the cost price = 166.44 

Then, 100% of the cost price = 146

If it were sold for Rs.154.76 then the profit = 154.76  - 146 = 8.76

Profit% =  \(\frac{8.76}{146}\) × 100 = 6%