b$)$ Report the proximate analysis data based on "raw coal" and "dry".

c$)$ Report the ultimate analysis on dry$-$ash$-$free basis.

d$)$ Determine the HHVdry of the coal $[$MJ kgdry ${?}^{-1}].$

e$)$ Determine the actual air$/$fuel ratio with $50\%$ excess air.

The ultimate analysis of dry coal is:

C:$39\mathrm{.}80$ wt$\%$

H:$3\mathrm{.}00$ wt$\%$

N:$0\mathrm{.}84$ wt$\%$

S:$0\mathrm{.}57$ wt$\%$