The structure below consists of a solid rectangular bar $\backslash ($ A B $\backslash ),$ two brackets that are fixed to the wall and a pin connecting the brackets and the bar at $\backslash ($ A $\backslash ).$ Diameter of the pin is $12\mathrm{.}5$ mm $.$

i$.$ Calculate the maximum normal stress in bar $\backslash ($ A B $\backslash ),$

ii$.$ Calculate the average shearing stress in pin at $\backslash ($ A $\backslash ),$

iii. Calculate the average bearing stress at $\backslash ($ A $\backslash )$ in the bar $\backslash ($ A B $\backslash ),$ and

iv$.$ Calculate the average bearing stress at $\backslash ($ A $\backslash )$ in the bracket,