The current network hash rate is ~240e15 hashes/second (240 million gigahashes/sec). So 54282 hashes/second as a fraction of the current network hash rate is 226e-15, which would yield approximately 5.65e-12 bitcoins every 10 minutes or 814e-12 per day which at current prices (~$400) would be 325e-9 dollars.

So your estimate of 30 cents a day is wildly optimistic.