Solution:
Given that;
Collins buy 60 eggs at a cost price of R110.
Where

If 5 dozens cost R110, then a dozen will cost

Hence, the cost price for a dozen of eggs is R22
b) He sold half of the eggs at R65 and the remaining half at R60
To find the profit,
Since half of the eggs is 30,
The total selling price will be

The profit made will be

The average profit per eggs will be

Hence, profit made per eggs is R0.25