3.5 isn't a proportion. As I understand your logic something at .50% lower cost (.5 times lower cost) would cost twice as much, right? Using your x=$20 you suggest dividing both sides by .5, so x/.5=20/.5=$40.

Sorry, proportion was not a good word to use, I think scale is better.

If the cost is $20, I would imagine something 2 times lower cost would be x/2. You can call it 50% lower cost, but then you would multiply by .5, not divide. So x/2=.5x=$10.

So, if something was 3.5 lower cost, I would assume you mean x/3.5.

So x costs $35, something else 3.5 lower cost is 35/3.5, or $10.

Thanks Michael, I imagine that you are correct in what was meant but I am trying to determine what the actual answer is rather than what we might imagine was intended. Perhaps I really need an English teacher, eh?

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