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1. Kalam bought two varieties of rice , costing Tk. 50 /kg and Tk. 60 /kg each , and mixed them in some ratio. Then he sold the mixture at Tk. 70/kg. Making a profit of 20% .What was the ratio of the mixture?-
- A. 1 : 10
- B. 1 : 10
- C. 1 : 10
- D. 1 : 10
Answer: Option B
Explanation:
Let, he bought x kg at 50/kg rate
y kg at 60/kg rate
So, the cost price = 50x + 60y
and sell price = 70 ( x + y)
Now, the profit was 20%
if cost price is 100 selling is 120 tk
if cost price (50x + 60y) selling is 120( 50x + 60y)/100
120(50x + 60y)/100 = 70(x + y)
60x + 72y = 70x + 70y
2y = 10x
5x = y
x/y = 1/5
x : y = 1 : 5
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