In what ratio should sugar costing ₹78 per kg be mixed with sugar costing ₹36 per kg so that by selling the mixture at ₹86.8 per kg, there is a profit of 24%?

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  1. 36 : 10
  2. 32 : 10
  3. 34 : 8
  4. 32 : 9

Answer (Detailed Solution Below)

Option 3 : 34 : 8
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Detailed Solution

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Given:

Cost price of sugar 1 = ₹78/kg

Cost price of sugar 2 = ₹36/kg

Selling price of mixture = ₹86.8/kg

Profit = 24%

Formula used:

CP of mixture = SP ÷ (1 + profit%)

Allegation rule: \(\frac{\text{Costlier}}{\text{Cheaper}} = \frac{\text{Mean CP} - \text{CP of cheaper}}{\text{CP of costlier} - \text{Mean CP}}\)

Calculation:

⇒ CP of mixture = 86.8 ÷ 1.24 = ₹70

Apply allegation:

⇒  (70 − 36) : (78 − 70) = 34 : 8

∴ Required ratio = 34 : 8

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