A company has budgeted to produce 5,000 units of Product B per month. The opening and closing inventories of Product B for next month are budgeted to be 400 units and 900 units respectively. The budgeted selling price and variable production costs per unit for Product B are as follows:

Total budgeted fixed production overheads are $29,500 per month. The company absorbs fixed production overheads on the basis of the budgeted number of units produced. The budgeted profit for Product B for next month, using absorption costing, is $20,700.

Prepare a marginal costing statement which shows the budgeted profit for Product B for next month.

What was the difference between the profit calculation using marginal costing and the profit calculation using absorption costing?