400 chickooes were bought at Rs. 1250 per hundred and were sold at a profit of Rs. 800. Find the selling price (in Rs. ) per dozen of chickooes.

Correct option is A

Given:
Cost Price of 100 chickooes = Rs. 1250
Total chickooes bought = 400
Profit = Rs. 800
Formula Used:
​$$\text{Total Cost Price} = \left( \frac{\text{Number of chickooes}}{100} \right) \times \text{Price per 100}$$​
Total Selling Price = Total Cost Price + Profit
​$$\text{Selling Price per dozen} = \left( \frac{\text{Total Selling Price}}{\text{Total number of chickooes}} \right) \times 12$$​​
Solution:
Total Cost Price =$$\left( \frac{400}{100} \right) \times 1250 = 4 \times 1250 = 5000$$​
Total Selling Price = 5000 + 800 = Rs. 5800
Selling Price per dozen = $$\left( \frac{5800}{400} \right) \times 12 = 14.5 \times 12 = \text {Rs.}174$$