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Answer:
C. $378
Step-by-step explanation:
Total cost of party = food & drink + game tokens + other
= 250 + 100 + 70
= $420
Deposit = 10% of total cost
= 10% of $420
= 0.1 x 420
= $42
Total cost still to pay = total cost - deposit
= 420 - 42
= $378