A landscaper can load and move a wheelbarrow of mulch in $4$ minutes. Due to the strenuous nature of the work, he needs to take a $12-$minute break after every hour of work. What is his utilization, assuming demand is $10$ wheelbarrow loads per hour? $66\mathrm{.}7\%,80\%,83\mathrm{.}3\%,100\%$