That's just the cost of the assembly line. The actual production line also includes other suppliers who will have to increase production to keep up with a new demand for a new production line. For eg, if BEL is manufacturing 16 radars for Tejas, if we setup a second line, they will have to increase capacity to 32 radars. For that, they will have to fund a new line. They will also have to double manpower. Due to increased demand for radars, the company, probably ASTRA, making T/R modules will have to double capacity and that will require more funding. Because ASTRA wants to increase capacity, the company manufacturing resistors, capacitors etc will have to double their production. Because of all this even their electricity and water consumption will increase. They will have to take care of all these. Companies supplying chemicals will have to double capacity in order to keep up. Even if one of them is unable to double their production capacity, then the second line will never happen. Doubling manpower is also not so easy. A company may take a decade just to do that. If the parent company says we will find someone else to provide the extra capacity, the first supplier may take the parent company to court citing breach of agreement. There are so many problems in just doubling capacity. It is not easily accomplished.