It looks like your query is incomplete or missing some numbers. To help you calculate how many hours it takes for a designer to make money on a Rs. 100 sneaker, I need to know:
- How much the designer makes per hour (Rs. ? per hour)
- Whether the Rs. 100 is the cost price, selling price, or profit target
Could you please provide the hourly wage of the designer or clarify the details? Then I can help you calculate the time needed.