How to solve

$($Boothroyd $Ch4$:$Q3)$: In a multipass rough$-$turning operation the tool life is observed to

obey an equation

$t=v^{-3}{f}^{-0\mathrm{.}8}{d}^{-0\mathrm{.}1}$

where $v,f,$ and $d$ are the cutting speed, feed, and depth of cut, respectively, in SI units. The

system normally operates with $v=1\frac{m}{s},f=0\mathrm{.}5mm,$ and $d=10mm.$ Estimate the effect

$($percent increase or decrease$)$ on tool life, cutting force, and power of doubling the metal

removal rate by increasing $($a$)$ the speed, $($b$)$ the feed, $($c$)$ the depth of cut.