The number of chairs that are disposed of after they're found to be damaged is 40/100*80 = <<40/100*80=32>>32.
The number of chairs in good condition in Kenzo's company is 80-32 = <<80-32=48>>48
The 48 chairs have 48*5 = <<48*5=240>>240 legs.
The round tables also have 20*3 = <<20*3=60>>60 legs.
In total, the furniture in Kenzo's company has 60+240 = <<60+240=300>>300 legs.
#### 300