Q90
An alloy is made by mixing metal A costing Rs. 2000 per kg and metal B costing Rs. 400 per kg in the ratio A : B = 3 : 1. What is the cost (in Rs.) of 8 kg of this alloy?
A.
1600
B.
9800
C.
6400
D.
12800
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Metal A = 2000 per kgMetal B = 400 per kg
∴ Cost of 8 kg of alloy = By mixing 6 kg metal A and 2 kg metal B
Cost = 6 × 2000 + 2 × 400 = Rs. 12,800