Answer :
Given, CP of 1 orange = 4
CP of 120 oranges = 
= 72
∴ SP of 72 oranges = 72 × 5
= 360
And SP of remaining oranges = (120-72) × 3.50
= 48 × 3.50
= 168
∴ Total SP of 120 oranges = 360 + 168
= 528
⇒ We know, that profit% = 
= 
= 10%
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