SOLUTION: The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spent $2000 a month on advertising, the revenue was $120,000. If the revenue is n

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Question 79343: The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spent $2000 a month on advertising, the revenue was $120,000. If the revenue is now $180,000, how much is the owner spending on advertising?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
r = revenue
a = advertising budget
k = constant of proportionality
r+=+k%2Aa
r+=+120000
a+=+2000
120000+=+k%2A2000
k+=+60
r+=+60a
180000+=+60a
a+=+3000
$3,000 is being spent on advertising when the
revenue is $180,000