Finding the kVA loading after improving the power factor
Basically you have (a) calculated the kVA loading correctly when the power factor is 0.65. In simple terms it's 55 kW ÷ 0.65 = 84.615 kVA.
You have also (b) calculated the current correctly i.e. 84.615 kVA ÷ 415 = 203.89 amps.
And, for (c) it looks like the set question is wrong because, when you have unity power factor, the power consumed by the load equals the VA hence, the answer is 55 kVA.