Can you calculate of trnsformer sum? Efficiency?

In a 20 KVA 3300/200 Vol single phase transformer iron loss and full load copper loss are 300 W & 400 w respectively. Calculate.
1) the efficiecny at haft full load 0.8 power factor lagging

Answer:
With a 0.8 power factor, a 20 KVA transformer produces 16 KW. With losses of 300 and 400 W at full load, the efficiency is (16,000 - (300 + 400)) / 16,000 = 95.625%. Should be so over the main portion of the power range so at 50% load it should definitely be about 95%.

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