Answer :

Ok so to do this we need to do
90008/(20*20*65*78) = 0.04438 (4 sf)
[tex]20\cdot20\cdot65\cdot78\cdot f = 90008\\ 2028000f=90008\\ f=\frac{90008}{2028000}=\frac{11251}{253500} [/tex]

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