皇族——王子你好：
125*12.5*31+125*2.5
=125*2.5*5*31+125*2.5
=125*2.5*(5*31+1)
=125*2.5*156
=125*2.5*4*39
=125*(2.5*4)*(40-1)
=125*10*(40-1)
=1250*40-1250
=50000-1250
=48750