1.400/2/5=400x5/2=1000 1000+800=18002.x+75%x=30 1.75x=30x=17.143.3.5x0.25+360x0.25+0.25x36.5=0.25(3.5+360+36.5)=0.25x400=1004.4800(1-5%)=45604560(1-10%)=4104
