we know that
[tex]543=(500+40+3) \\ 36=(30+6)[/tex]
so
[tex](543*36)=(500+40+3)*(30+6) \\ \\ =(500*30+500*6)+(40*30+40*6)+(3*30+3*6) \\ \\ =(15,000+3,000)+(1,200+240)+(90+18) \\ \\ =(18,000+1,440+108) \\ \\ =19,548[/tex]
the answer is
[tex]19,548[/tex]
