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Rohanx9
Joined: 15 Jul 2024
Last visit: 16 Apr 2026
Posts: 49
Own Kudos:
Given Kudos: 5
Location: Australia
Schools: Anderson (UCLA) (WD)
GPA: 6.188
16 Jul 2025, 20:54
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Solved in 1 min 02 seconds by plugging in values.
Assume x = 0 which means:
Initial cost = $100
New cost = $20
% change we're looking for is \(100* \frac{(20-100)}{100} =-80\)%
Only option B yields -80%, and therefore is our answer.
If there was another answer that also yielded 80%, we'd simply test another set of numbers i.e. x=1 and figure out what matches out of the two answers.
Assume x = 0 which means:
Initial cost = $100
New cost = $20
% change we're looking for is \(100* \frac{(20-100)}{100} =-80\)%
Only option B yields -80%, and therefore is our answer.
If there was another answer that also yielded 80%, we'd simply test another set of numbers i.e. x=1 and figure out what matches out of the two answers.
26 Jul 2025, 10:52
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Not convinced with the answer as there is an ambiguity .. Change means change.. either Final-Initial or initial-final ... atleast that's what I have known since elementary school. Given that its quite plausible that D can be the answer
Bunuel
Rohanx9
Joined: 15 Jul 2024
Last visit: 16 Apr 2026
Posts: 49
Own Kudos:
Given Kudos: 5
Location: Australia
Schools: Anderson (UCLA) (WD)
GPA: 6.188
26 Jul 2025, 20:36
Kudos
Bookmarks
Assume x = 0
% change = (20-100)/100 = -0.8 = -80%.
Only Option B gives us -80%.
% change = (20-100)/100 = -0.8 = -80%.
Only Option B gives us -80%.
