Identify the rate of change of the function.
2 answers:
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Let's name all the purchases "x"
so
of them were stuffed animals, and out of that 
were bears.
to get the results we have to multiply the fraction of bears by the fraction of the stuff animals:
.
and now we simplify:
=
and this is the answer!
so
to get the results we have to multiply the fraction of bears by the fraction of the stuff animals:
and now we simplify:
and this is the answer!