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A methods and measurements analyst for timepiece, inc. needs to develop a time standard for the task of attaching a watch to a wristband. In a preliminary study, he observed one of his workers perform this task five times, with the following results: observations$-1,2,3,4,5$ time$($seconds$)$: $27,19,20,21,13$ What is the standard time for this task if the employee worked at $20$ percent faster pace than average and an allowance of $20s$ percent of the job time is used? $5$ seconds, $20$ seconds, $4\mathrm{.}5$ seconds, $28\mathrm{.}8$ seconds, or $100$ seconds$$