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For some quarterly sales data, the trend has been calculated as increasing by 6 each quarter and the average seasonal variation for the 3rd quarter as -22.5. The most recent data available is for the second quarter of Year 3 when sales were 370 units, and a centred moving average or the fourth quarter of Year 2 was 330.625 units.
Using the additive model, what are predicted sales for the third quarter of Year 3?
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