It costs sheffield corp. $12 of variable and $5 of fixed costs to produce one bathroom scale which normally sells for $35. a foreign wholesaler offers to purchase 4500 scales at $15 each. garner would incur special shipping costs of $1 per scale if the order were accepted. sheffield has sufficient unused capacity to produce the 4500 scales. if the special order is accepted, what will be the effect on net income?