1. The problem involves a girl who buys and sells bread, gaining 20 Rs on each piece sold. 2. We are given that $P = 6000$ in the user's statement, but then it also says $P = 70$ and $p= 2C$, which likely need clarification. 3. The main question is: How many pieces must she sell to get a net profit of 50 Rs per day, considering she spends some money on her feet (travel costs) each day. 4. Let's define variables: - Let $x$ be the number of breads sold. - The gain per bread is 20 Rs, so total gain is $20x$. - Let the daily fixed cost (travel or other expenses) be $C$ Rs. 5. The net profit per day should be 50 Rs: $$20x - C = 50$$ 6. Solving for $x$: $$20x = 50 + C$$ $$x = \frac{50 + C}{20}$$ 7. If the problem provides $C$ or if $P=70$ refers to some cost, then substitute that for $C$. 8. For example, if $C = 70$ Rs daily cost: $$x = \frac{50 + 70}{20} = \frac{120}{20} = 6$$ 9. So, she must sell at least 6 breads per day to achieve a profit of 50 Rs, after covering the daily expenses. Final answer: The girl needs to sell $$\boxed{6}$$ breads daily.