Overcurrent pickup: PE Power Protection practice question

A 12.47 kV distribution feeder carries a maximum balanced load of 8.5 MVA. Its phase time-overcurrent relay is fed from 600:5, C200 CTs. Utility practice sets the phase pickup at 150% of maximum load current to leave margin above maximum load for cold-load pickup and load growth. The relay pickup setting in secondary amperes is most nearly: