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For the forthcoming year, GHI’s variable costs are budgeted to be 60% of the sales value and fixed costs are budgeted to be 10% of sales value. If GHI increases its selling prices by 10%, but if fixed cost, variable costs per unit and sales volume remain unchanged, the effect on GHI’s contribution would be: A. A decrease of 2% B. A n increase of 5% C. A n increase of 10% D. A n increase of 25%