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U6 Corp.'s cost formula for its scuba diving operating cost is $2,910 per month plus $321 per scuba diving-day. For the month of April, the company planned for activity of 16 scuba diving-days, but the actual level of activity was 14 scuba diving-days. The JZ S's actual scuba diving operating cost for the month was $8,320. (IL Q. The spending variance for scuba diving operating cost in April would be closest to