Given: The shown gear set operates $60$ hours per week, $52$ weeks per year and must survive for $4$ years without gear failure. A motor drives the input shaft at $2700$rpm involving "light shock", while the driven machinery involves "moderate shock". The shafts and mountings are manufactured using ordinary good industrial practice, but not "high$-$precision". Conduct the power rating calculations for the gear set $($last pinion$)$ assuming $99\%$ reliability and FOS of $1\mathrm{.}2.$

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