Using a system of equations, the cost per apple would be $1.80
Let the amount he has now = p
Cost per apple = a
15a = 2.10 + p - - - (1)
12a = p - 3.30 - - - (2)
From (1) :
p = 15a - 2.10 - - - - (3)
Substitute (3) into (2)
12a = 15a - 2.10 - 3.30
Collect like terms
12a - 15a = - 3.30 - 2.10
-3a = - 5.40
Divide both sides by - 3
a = $1.80
Hence, the cost per apple is $1.80
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