31 When Brenda opened the invoice that arrived with the delivery of the office supplies order she was horrified when she saw that the total gross cost was $380.
Upon checking carefully, however, she realised that on the order form she had put a tick by
boxes of 12 pens instead of individual pens, but correctly entered the quantity required as 15.
She consoled herself that they would all get used eventually, and at least they were only $18 per
box whereas the individual pens would have cost $2 each. Further consolation came when she
read that customers ordering more than $200 worth of goods should deduct 10% from the total
gross cost.
When Brenda settles the invoice, how much more will she have spent than she intended?
A $202
B $213
C $216
D $232
E $243

light-year  

the distance that light travels in a vacuum in one year, equal to about 9.46 trillion km (5.88 trillion mi). light-years are used in measuring interstellar and intergalactic distances.  

parsec  

a unit of distance used in astronomy, equal to about 3.25 light years (3.08 × 1016 meters).  

parallax  

the apparent angular displacement of a celestial body due to its being observed from the surface instead of from the center of the earth (diurnal parallax or geocentric parallax) or due to its being observed from the earth instead of from the sun (annual parallax or heliocentric parallax)  

absolute magnitude  

the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.  

apparent magnitude  

the magnitude of a celestial object as it is actually measured from the earth.  

redshift  

an increase in the wavelength of radiation emitted by a celestial body as a consequence of the doppler effect.  

the great thing about your imagination is that it doesn't have to make sense! if i were you i would be stuck in space, no communication with earth travelling around and around, you can only guess how long its been since your communication broke down. you land on an undiscovered planet, you do a scientific investigation examining the elements and conditions. you come across alien lifeforms.  

best of luck!

the answer should be a