Some fruits are bought at 15 for ₹140 and an equal number of fruits at 10 for ₹120. If all the fruits are sold at ₹132 per dozen, then what is the profit percent in the entire transaction?

$3 \frac{1}{8}$

Let total fruit brought = 30

So, Let 30 fruits are bought at 15 for Rs. 140,

 then cost of 30 fruits = \(\frac{140}{15}\) × 30 = Rs. 280

⇒ 30 fruits are also brought at 10 for Rs. 120, then cost of 30 fruits = \(\frac{120}{10}\) × 30 = Rs. 360

⇒ Total cost of 60 fruits = Rs. 280 + Rs. 360 = Rs. 640

SP of 12 fruits = Rs. 132

SP of 1 fruit = Rs. 11

SP of 60 fruits = Rs. 11 × 60 = Rs. 660

Profit = 660 – 640 = Rs. 20 

Profit percent = \(\frac{20}{640}\) × 100 =  3.125