self Maths Puzzle

At a certain factory, each employee working the second shift produced 2/3 as many widgets as each employee working the first shift. If the first shift has 3/4 as many employees, what fraction of the total widgets did the second shift produce?

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self Other Question

any shorcut method to find value of a factorial ,for e.g.
value of 100!?
complete the series
0, 14, 78 ...