$4-$ Design a concrete mix using BS $8328$ for the following information:

QC $=$ Very Good

$\%$ defects $,=2\%$

Cement type $,=,$ SRPC

$-28$ days $FC,=,30$MPa

Slump $,=,70mm$

Coarse aggregate $,=,$ crushed stone

NMS $,=,40mm$

FM of sand $,=,2\mathrm{.}5$

Exposure condition $=$ moderate

Concrete cover $=35mm$

Specific gravity of sand and gravel $=2\mathrm{.}7$