解:∵∠A+∠ABC+∠ACB=180, ∠A=50∴∠ABC+∠ACB=180-∠A=180-50=130∵BP平分∠ABC∴∠PBC=∠ABC/2∵CP平分∠ACB∴∠PCB=∠ACB/2∴∠BPC=180-(∠PBC+∠PCB)=180-(∠ABC/2+∠ACB/2)=180-(∠ABC+∠ACB)/2=180-130/2=180-65=115°