Question 1190479
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S = number of 30-second ad slots sold
150S = amount of money collected from those ads (ignore the 60 second ads)


Now we consider the longer ad length.
There are 45 ads in length of 60 seconds each
If it costs $270 per ad of this longer time length, then the radio station pulls in 45*270 = 12,150 dollars 


In total, the station pulls in <font color=red>150S + 12,150</font> dollars from both ad types combined.
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