If the cost of 15 eggs is Rs 75, find the total cost of 5 dozen (60) eggs.

Introduction:
This is a direct unit-rate proportion problem in profit and loss / basic arithmetic pricing.

Given Data / Assumptions:

• 15 eggs cost Rs 75
• We want the cost of 5 dozen = 60 eggs

Concept / Approach:
Compute cost per egg, then multiply by 60.

Step-by-Step Solution:
Cost per egg = 75 / 15 = Rs 5Total for 60 eggs = 60 * 5 = Rs 300

Verification / Alternative check:
Proportionally, if 15 cost 75, then 60 (which is 4 times 15) costs 4 * 75 = 300.

Why Other Options Are Wrong:
400, 500, 600: Do not match proportional scaling.

Common Pitfalls:
Confusing dozen count; forgetting 1 dozen = 12 eggs.

Final Answer:
300