52051
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J-10 is a 4th and 4.5th gen fighter jet and was needed in numbers because it is replacing huge numbers of J-7/J-8 and other 3rd generation jets in PLAAF and not to forget J-10 cost 40-50 million $ (any versions) whereas J-20 estimated cost 110-150 million $ and will be more maintenance prone so in more realistic assumption 300-400 or may be 500 J-20 will be enough for china just my 2cents
You have no idea:
The main reason is China produce all this stuff in China so you cannot really calculate the cost this way.
For instance China today produce 3x-5x more type 052D/type 055 DDGs than China did with old school 051B/C/052C.
China's military producation/expanding is at an accerlating phase, you cannot simply project the past to the future, otherwise you may deduce that China will build no more than 2 type 052D, instead of over 20 by now.
In the past, China's military was using the so-called "small step and rapid evoluation" strategy during 2000s, since at that time, China dont have military hardware that is on-peer with the US, so they just produce a few of each designs to keep the factory running but spend lots money on developing future systems.
But nowadays when the military can buy weapon system thats is on peer with the US, they will start to place very large orders, like 20+ type052D or 8+ type 055 in the first batch.
And thats why they produce 4 production line of J-20 instead of merely one just like J-10 had.
China will produce 700-1000 J-20, for PLAAF and PLAN.