Answer: 88.4
Explanation:
78 * 1 = 78
90 * 1 = 90
85 * 2 = 170
89 * 2 = 178
92 * 4 = 368
368 + 178 = 546
546 + 170 = 716
716 + 90 = 806
806 + 78 = 884
884/10 = 88.4
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