In a combed yarn production line,

Feed$/$Nip $=8mm$

Nips$/$ min$=250$

Feed Lap hank $=Ne0\mathrm{.}01$

Delivery sliver hank $=Ne0\mathrm{.}16$

Noil $=21\%$

No$.$ of head$/$frame $=8$

Efficiency $=85\%.$

Production of drawframe II: $200kg/$hour

Drawframe II waste: $0,4\%$

Calculate the number of combers required.