the answer is $173.25( I had a question for this and i got it correct hope this helps)
Try this explanation/solution:
a) the system which describes this situation is:

b) the solution of the system made up:

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The correct answer is (( D )) .
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D. Worm! Viruses, worms, rasonware, Trojans, bonets, and adware are also some examples!
They are the same because 14 is 2*7 and 21 is 3*7.