The owner of Kat Motel wants to develop a time standard for the task of cleaning a

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Question:

The owner of Kat Motel wants to develop a time standard for the task of cleaning a cat cage. In a preliminary study, she observed one of her employees perform this task six times, with the following results:
OBSERVATION123456
TIME (SECONDS)998790819390

What is the standard time (ST) for this task if the employee worked at a fifty percent faster pace than is average, and an allowance of ten percent of the workday is used
a 100 sec
b 168.8 sec
c 90 sec
d 99 sec
e 150 sec