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27. The standard set for material consumption was 100 kg @? 3.25 per unit. In a cost period: Opening stock was 100 kg @ 3.25 per unit. Purchases made 500 kg @ 3.15 per unit. Consumption 110units Calculate: a)Usage Variance b)Price Variance 1) When variance is calculated at point of purchase 2) When variance is calculated at point of issue on FIFO basis 3) When variance is calculated at point of issue on LIFO