For$$ Elliot's dog$-$walking$$ service, the only variable input is labor.$$ Elliot's labor costs are$$ $$300$ a day and his service walks $30$ dogs per day. To walk $31$ dogs per$$ day, his labor costs increase to$$ $$305$ a day.

The marginal cost of walking that $31$st dog is

Part $2$

A$.$

$$ $$5.$

B$.$

$$ $$9\mathrm{.}83.$

C$.$

$$ $$19\mathrm{.}52.$

D$.$

indeterminate from the information given.

Part $2$

A$.$

added capital

increases how quickly labor's returns become diminishingincreases$$how$$quickly$$labor$\text{'}$s$$returns$$become$$diminishing$.$

B$.$

agricultural production becomes more$$ labor$-$intensive.

C$.$

using less labor increases production capacity.

D$.$

added capital

increases the productivity of laborincreases$$the$$productivity$$of$$labor$.$

E$.$

decreased capital increases agricultural output.