For three consecutive years, the costs of a product were Rs. 114 per litre, Rs. 228 per litre and Rs. 285 per litre respectively. If a common man spends an average of Rs.12540 per year on that product, then what is the average cost of that product per litre for the three years? (In Rs.)

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  1. 182
  2. 180
  3. 178
  4. 184

Answer (Detailed Solution Below)

Option 2 : 180
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यूपी पुलिस SI (दरोगा) सामान्य हिंदी मॉक टेस्ट
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Detailed Solution

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Given:

Cost of product in 1st year = Rs. 114 per litres

Cost of product in 2nd year = Rs. 228 per litres

Cost of product in 3st year = Rs. 285 per litres

Formula used:

Average cost = Total cost / Number of product

Calculation:

Number of product in 1st year = 12540 / 114 = 110

Number of product in 2nd year = 12540 / 228 = 55

Number of product in 3rd year = 12540 / 285 = 44

Average cost = (3 × 12540) / (110 + 55 + 44)

⇒ 37620 / 209

⇒ 180 per litres

∴ The average cost of that product per litre for the three years is Rs. 180 per litres

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