3000mm high 75mm Cavity Wall 102,5 mm Group 1 clay brick masonry unit outer skin and 140 mm thick Group 1 concrete block

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3000mm high 75mm Cavity Wall 102,5 mm Group 1 clay brick masonry
unit outer skin and 140 mm thick Group 1 concrete block masonry
unit inner skin. Cavity Wall (W2) end condition restrained at top
and bottom. Manufacturing control is Category I, Designation M4
general purpose mortar Class 1 execution control will be used on
site. The lower lift of a 4-storey cavity wall carries a design
load of 130 kN/m run. 10 kN/m of this is applied at an eccentricity
of t/6 to the inner leaf of the bottom lift. The remaining load
from the floors above is applied concentrically to the same leaf.
What strength of concrete block masonry unit is required? Calculate
the vertical load capacity of the wall with the block masonry unit
strength actually selected.