Minu acquired sunglasses for Rs. 1000 and sold them to Kanu at a 20% profit.
Minu's purchase price was Rs. 1000. Her selling price to Kanu was Rs. 1200, resulting in a profit of Rs. 200.
Kanu sold the sunglasses back to Minu at a 20% loss. This calculated sale price was:
\(80\% \times 1200 = 960\)
Minu repurchased the sunglasses from Kanu for Rs. 960.
Minu's total desired profit is Rs. 500. Having already earned Rs. 200, she requires an additional Rs. 300 profit.
Minu's selling price to Tanu was:
\(960 + 300 = 1260\)
The profit from the final sale was Rs. 300. The profit percentage is calculated as:
\(\frac{300}{960} \times 100 = 31.25\%\)
The profit percentage on the final sale was 31.25%.
The correct option is (D): 31.25%.