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First, we need to calculate how much each person earns from the busking.
Total amount earned from busking = $52
Number of people sharing the earnings = 4 (Bart and 3 friends)
Amount each person earns from busking = $52 / 4 = $13
Now, we need to calculate how much Bart earns from selling CDs.
Number of CDs sold = 5
Price per CD = $15
Total amount earned from selling CDs = 5 * $15 = $75
Now, we need to calculate Bart's total earnings by including the amount earned from selling CDs and subtracting the permit fee.
Total earnings = Amount earned from busking + Amount earned from selling CDs - Permit fee
Total earnings = $13 + $75 - $15
Total earnings = $73
Therefore, Bart earns a total of $73.