A merchant mixes 60 kg of coffee at ₹90 /kg with a dearer variety at ₹120 /kg. He sells the blend at ₹110 /kg and gains 10 % profit. How many kg of the dearer variety did he add?
Show answer & explanation
Correct answer: A
Explanation
Selling price = ₹110 per kg
Profit = 10%
Cost price = 110 × 100/110 = ₹100 per kg
₹90 variety : ₹120 variety
(120 − 100) : (100 − 90)
= 20 : 10
= 2 : 1
Cheaper : Costlier = 2 : 1
60 kg = 2 parts
1 part = 30 kg
Costlier coffee = 30 kg