Assume Quentin Company has the following percent returns during $2016-2020$:

Returns:

$2016=13\mathrm{.}5\%$

$2017=32\mathrm{.}35\%$

$2018=4\mathrm{.}54\%$

$2019=8\mathrm{.}99\%$

$2020=-6\mathrm{.}25\%$

Based on above $,$ calculate:

a$.$ Arithmetic average

b$.$ Geometric average