On the 4th stage, 81 friends will be called to be told of the news
99
because 0.49 is less than 0.5(0), we round it down.
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Price she paid, P = $80 .
She sells the bicycle at 1/4 of the price she paid.
Let, buying price is x.
So, as given in question selling price will be x/4.
Also, selling price is given as $80 .
Therefore, Steph pay $320 for the bicycle.
Hence, this is the required solution.