A $12mm400mm$ steel plate has staggered holes arranged as shown. Use LRFD$.$

$\backslash$table$[["$B$",$Fy$,$Fu$],[$Even$,248$ Mpa,$400$ Mpa$],[$Odd$,241$ Mpa,$414$ Mpa$]]$

$\backslash$table$[[A",$Bolt Dia.$],[1-2,16$ mm$],[3-4,18$ mm$],[5-6,20$ mm$],[7-8,22$ mm$],[9-0,25$ mm$]]$

a$.$ Calculate the gross area in $m{m}^2.$

b$.$ Calculate $"$Pu$"$ in KN considering tension failure on gross area.

c$.$ Calculate the distance $"b"$ so that the net area in path $1-2-3-4$ is equal to the net area of path $1-2-4?$

d$.$ Using the computed value of $"b",$ find and solve for the critical net area.

e$.$ Calculate $"$Pu$"$ in KN considering tension failure on critical net area.

f$.$ Calculate the maximum safe tensile force Pu that the steel plate could carry?