SOLUTION: Jay can buy a stereo either online or at a local store if he buys online he gets a 15% discount but he has to pay a $12 shipping fee at the local store the cereal is not on sale b

Algebra ->  Inequalities -> SOLUTION: Jay can buy a stereo either online or at a local store if he buys online he gets a 15% discount but he has to pay a $12 shipping fee at the local store the cereal is not on sale b      Log On


   

Question 1084161: Jay can buy a stereo either online or at a local store if he buys online he gets a 15% discount but he has to pay a $12 shipping fee at the local store the cereal is not on sale but there is no shipping fee for what regular price is it cheaper for Jay to buy a stereo online
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = the regular price
For buying online:
+x+-+.15x+%2B+12+
+.85x+%2B+12+
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For what value of +x+ is
buying online cheaper?
+.85x+%2B+12+%3C+x+
subtract +.85x+ from both sides
+12+%3C+.15x+
+80+%3C+x+
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When the regular price is greater than $80
it is cheaper to buy online
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check:
+x+=+80+
Online price=
+.85x+%2B+12+=+.85%2A80+%2B+12+
+.85x+%2B+12+=+68+%2B+12+
+.85x+%2B+12+=+80+
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+x+=+81+
+.85x+%2B+12+=+.85%2A81+%2B+12+
+.85x+%2B+12+=+68.85+%2B+12+
+.85x+%2B+12+=+80.85+
So, when the regular price is $81, the
online price is $80.85
OK