Arunachalam Narayanan has been clocked performing three work elements in the$$ office, with the results shown in the following table. The allowance for tasks such as this is $15\%.$

$$

Observations$($seconds$)$

Element

$1$

$2$

$3$

$4$

$5$

$6$

Performance Rating$(\%)$

$1$

$14$

$18$

$11$

$13$

$51*$

$16$

$90$

$2$

$3*$

$24$

$21$

$73*$

$25$

$30$

$120$

$3$

$3\mathrm{.}1$

$3\mathrm{.}7$

$3\mathrm{.}4$

$2\mathrm{.}1$

$3\mathrm{.}5$

$3\mathrm{.}9$

$110$

$*$Disregardlong dashpossible error.

Part $2$

$$a$)$ The normal time for the process is

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