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Parker Beverages sells a variety of protein shakes and fruit juices to small health food stores. Parker purchases the shakes and juices from leading manufacturers. Identify each of the following costs incurred by Parker Beverages in terms of its cost behavior$-$variable, fixed, mixed, or step.

a$.$ ?Human resource director salary

$0.8-$ounce protein shake

Monthly delivery truck lease payment of $$350$

d$.$ ?Straight line depreciation on office equipment

e$.$ ?Shipping $($billed in $100-$case increments$)$

f$.$ ?Sales commission $(4\%$ ?of sales revenue$)$

g$.$ ?Copy machine rental $($monthly fee of $$35$ ?plus $$0\mathrm{.}01$ ?percopy$)$

Parker Beverages sells a variety of protein shakes and fruit juices to small health food stores. Parker purchases the shakes and juices from leading manufacturers. Identify each of the following costs incurred by Parker Beverages in terms of its cost behavior$-$variable, fixed, mixed, or step.

a$.$ ?Human resource director salary

$8-$ounce protein shake

Monthly delivery truck lease payment of $$350$

d$.$ ?Straight line depreciation on office equipment $?$

e$.$ ?Shipping $($billed in $100-$case increments$)?$

f$.$ ?Sales commission $(4\%$ ?of sales revenue$)$

$8.$ ?Copy machine rental $($monthly fee of $$35$ ?plus $$0\mathrm{.}01$ ?per copy$)?$