135*12.5
=(100+35)*(10+12.5)
=100*10+35*10+100*12.5+(30+5)*(10+2.5)
=1000+350+1250+30*10+30*2.5+5*10+5*2.5
=2600+300+75+50+12.5
=3037.5
135*12.5
=(100+35)*(10+12.5)
=100*10+35*10+100*12.5+(30+5)*(10+2.5)
=1000+350+1250+30*10+30*2.5+5*10+5*2.5
=2600+300+75+50+12.5
=3037.5