What is the formula of window space factor, when the transformer rating is 20 kVA?

What is the formula of window space factor, when the transformer rating is 20 kVA? Correct Answer 8 / (30+kV)

10 / (30+kV) denotes the empirical value of window space factor for rating between 50-200 kilo-volt-amp. 12 / (30+kV) is the window space factor for transformers having rating around 1000 kVA.
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