Please answer this using NSCP $2010/2015.$Use four decimals, I will upvote if this problem answer correctly according to instruction above.

A short rectangular reinforced concrete column $500mm$ wide by $700mm$ deep contains $8-28mm$ longitudinal bars along one of shorter $($tension$)$ sides and $5-28mm$ bars on the other shorter $($compression$)$ side, the centroid of the bars located $70mm$ from the concrete surface. Concrete strength $f^{\text{'}}c=25$MPa and steel strength $fy=415$MPa

a$)$ Determine the location of plastic centroid $($make the middle be the reference$)$

b$)$ Determine the balance compressive load for the column section

c$)$ Determine the balanced eccentricity $($from plastic centroid of the column$)$

d$)$ Determine the axial capacity of the column that can be applied at an eccentricity of $300mm$