# Raman buys potatoes at Rs. 6, Rs. 8 and Rs. 10 per kg for three successive years. What is the average cost per kg of potatoes if he spends Rs. 1500 ea

23 views
in Aptitude
closed
Raman buys potatoes at Rs. 6, Rs. 8 and Rs. 10 per kg for three successive years. What is the average cost per kg of potatoes if he spends Rs. 1500 each year approximately?
1. Rs. 7.71
2. Rs. 6.17
3. Rs. 7.66
4. Rs. 6.71

by (53.1k points)
selected

Correct Answer - Option 3 : Rs. 7.66

Given

Raman buys potatoes at Rs. 6, Rs. 8 and Rs. 10 per kg for three successive years.

Money spend on potatoes each year = Rs. 1500

Formula Used

Average = Sum of observations / Number of observations

Calculation

Total quantity of potatoes consumed in 3 successive years = Rs. [(1500 / 6) + (1500 / 8) + (1500 / 10)] = Rs. [1500 × {1 / 6 + 1 / 8 + 1 / 10}] = 1500 × (47 / 120) = Rs. (70500 / 120)

Total amount spent = Rs. (1500 × 3) = Rs. 4500

Average cost = (4500) / (70500 / 120) = Rs. 7.66

∴ the average cost is Rs. 7.66 per kg of potatoes.