$[1/3$ Points$]$

WANEFMAC$715\mathrm{.}2\mathrm{.}049.$

Your weekly cost $($in dollars$)$ to manufacture $x$ cars and $y$ trucks is as follows.

$C(x,y)=200,000+5,500x+4,300y-100,000e^{-0\mathrm{.}01(x+y)}$

What is the marginal cost of a car?

$$ dollars

What is the marginal cost of a truck?

$$ dollars

How do these marginal costs behave as total production increases?

Marginal cost of a car increases and marginal cost of a truck decreases as production rises.

Marginal cost of a car decreases and marginal cost of a truck increases as production rises.

Both marginal costs increase as production rises.

Both marginal costs decrease as production rises.

The marginal costs do not depend on the total production.