Two three phase transformers rated at 500KVA and 450KVA respectively are connected in parallel to supply a load of 1000KVA at 0.8PF lagging. The per phase leakage resistance and reactance of $1^{st}$ transformer is 2.5% and 6% respectively and $2^{nd}$ transformer are 1.6% and 7% respectively. Calculate the KVA load and PF at which each transformer operates.