An assembly line has $10$ continuous stations with process times of $1,2,3,4,$dots,$6$ respectively. The process time of the system is

$28\mathrm{.}57\%$ of the cycle time

$100\%$ of the cycle time

$2\mathrm{.}857\%$ of the cycle time

$4\mathrm{.}76\%$ of the cycle time