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Bob, being the forgetful person he is, left his office window open when he left for the evening.

The air temperature during the day was $22\ ^\circ\text{C}$ with a density of:

$$\rho =1.192\text{ kg/m}^{ 3 }$$

At night the outside air temperature dropped to $10\ ^\circ\text{C}$ with a density of:

$$\rho =1.243\text{ kg/m}^{ 3 }$$

By which of the following percents did the office air mass (evening to morning) change?

(Assume the air pressure remains constant.)

A

$-4.10\%$

B

$4.10\%$

C

$-4.30\%$

D

$4.30\%$

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