An alloy is made by mixing metal A costing Rs 2000/kg and metal B costing Rs 400/kg in the ratio A:B = 3:1. What is the cost (in Rs) of 8 kilograms of this alloy?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4. i.e. 12800
Price of 1 kg of this alloy = 
= Rs.1600
Price of 8 kg = 8 × 1600 = Rs.12,800