Metal Casting Products $($MCP$)$ plans to replace its existing metal casting facility with a new one. MCP is considering two possible capacities for the new facility: $300,000$ or

$450,000$ units per year. The $300,000$ unit plant would have an annual fixed cost of Rs$.$

$5000,000$ and a per unit production cost of Rs$.45$; the $450,000$ unit plant would have an annual fixed cost of Rs$.7000,000$ and a per unit cost of Rs$.38.$ Suppose MCP projects its sales to be $180,000$ units next year and it expects them to grow by $6-8\%$ each year for the $10$ years. Which capacity option would you

recommend and why?