SOLVED PROBLEM $10\mathrm{.}2$

A work operation consisting of three elements has been subjected to a stopwatch time study. The recorded observations are shown in the following table. By union contract, the allowance time for the operation is personal time $5\%,$ delay $5\%,$ and fatigue $10\%.$ Determine the standard time for the work operation.

$\backslash$table$[[\backslash$table$[[$JOB$],[$ELEMENT$]],$OBSERVATIONS $($MINUTES$),\backslash$table$[[$PERFORMANC$],[$RATING $(\%)]]],[1,2,3,4,5,6],[$A$,\mathrm{.}1,\mathrm{.}3,\mathrm{.}2,\mathrm{.}9,\mathrm{.}2,\mathrm{.}1,90],[$B$,\mathrm{.}8,\mathrm{.}6,\mathrm{.}8,\mathrm{.}5,3\mathrm{.}2,\mathrm{.}7,110],[$C$,\mathrm{.}5,\mathrm{.}5,\mathrm{.}4,\mathrm{.}5,\mathrm{.}6,\mathrm{.}5,80]]$