Question: If 18 kg of berries cost $90, how much will 12 kg cost?
A) $45
B) $50
C) $55
D) $60
Solution:
Step 1: Find the cost per kg of berries.
Cost per kg = 90dollars/18kg = 5dollars/kg
Step 2: Use the unitary method to find the cost of 12 kg.
Cost of 12 kg = 12kg×5dollars/kg=60dollars
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