A vendor bought 100 oranges at ₹ 8 each. He sold 80 of them at ₹10 each and the remaining 20 oranges at ₹6 each. What is his overall profit or loss percentage?

Correct option is D

Given
Cost Price (CP) of 1 orange = ₹ 8
Total oranges bought = 100
Selling Price (SP) of 80 oranges = ₹ 10 each
Selling Price (SP) of remaining 20 oranges = ₹ 6 each

Formula Used
Total CP = CP per unit $$\times$$​Total units
Total SP = Sum of SP of all sold items
Profit Percentage =  $$\frac{\text{Total SP} - \text{Total CP}}{\text{Total CP}} \times 100$$​​

Solution
Calculate Total Cost Price:
Total CP = $$100 \times 8 = 800$$​​
Calculate Total Selling Price:
SP from first 80 oranges = $$80 \times 10 = 800$$​​
SP from remaining 20 oranges = $$20 \times 6 = 120$$​​
Total SP = 800 + 120 = 920
Calculate the profit:
Profit = 920 - 800 = 120
Calculate Profit Percentage:
Profit % =  $$\frac{120}{800} \times 100 = 15\%$$​​

Final Answer
So the correct answer is (d)