A material is crushed in a Blake jaw crusher and the average size of particle is

reduced from $20\mathrm{.}0$ x $10-3$m to $10\mathrm{.}0$ x $10-3$m with a power requirement of $4\mathrm{.}7$kW per

kilogram of feed. How much energy would be required per kilo for the crushing of the

same material from a size $50$ x $10-3$m to a size of $25$ x $10-3$m

$($i$)$ Assuming Rittinger's law applies?

$($ii$)$ Assuming Kick's law applies?