100*(160+240)=40000
1) 160+240=400
2) 100*400=40000
(8400-4800):100=36
1) 8400-4800=3600
2) 3600:100=36
100*(160+240)=40000
1) 160+240=400
2) 100*400=40000
(8400-4800):100=36
1) 8400-4800=3600
2) 3600:100=36