Answer:
The price for the forth top is $93
Explanation:
Let the price of the forth top = y
(30+15+18+y) / 4 = 39
(63+y) / 4 = 39
63+y = 39 x 4
63+y = 156
y = 156 - 63
y = 93
(30+15+18+39) / 4 = 39.
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