A store keeper bought 200 eggs for N2000. 20 eggs were broken. If he made a profit of 20% from the sales of the good eggs, what is the selling price of 10 eggs?

The store keeper bought 200 eggs for N2000.

$$\text{Cost price per egg} = \frac{\text{Total cost}}{\text{Number of eggs}}$$ $$\text{Cost price per egg} = \frac{\text{N}2000}{200 \text{ eggs}} = \text{N}10 \text{ per egg}$$

Total eggs bought = 200.
Broken eggs = 20.

$$\text{Number of good eggs} = 200 - 20 = 180 \text{ eggs}$$

The store keeper made a profit of 20% from the sales of the good eggs.
The cost of the good eggs (180 eggs) is $180 \times \text{N}10 = \text{N}1800$.

$$\text{Profit amount} = 20\% \text{ of N}1800$$ $$\text{Profit amount} = 0.20 \times \text{N}1800 = \text{N}360$$ $$\text{Total selling price of good eggs} = \text{Cost of good eggs} + \text{Profit amount}$$ $$\text{Total selling price of good eggs} = \text{N}1800 + \text{N}360 = \text{N}2160$$

The total selling price for 180 good eggs is N2160.

$$\text{Selling price per good egg} = \frac{\text{Total selling price}}{\text{Number of good eggs}}$$ $$\text{Selling price per good egg} = \frac{\text{N}2160}{180 \text{ eggs}} = \text{N}12 \text{ per egg}$$

$$\text{Selling price of 10 eggs} = 10 \times \text{Selling price per good egg}$$ $$\text{Selling price of 10 eggs} = 10 \times \text{N}12 = \boxed{\text{N}120}$$