Data concerning Atlanta Corporation's single product appear below:

Monthly fixed expenses $87,000

Current unit sales per month 1,000

Per unit information

Selling price $160.00 100%

Variable expenses $48.00 30%

Contribution margin $112.00 70%

The company will begin using a higher quality raw material.

This change will increase the quality of the product.

The variable cost per unit will increase by $28.

Sales will increase by 400 units per month.

What should be the overall effect on monthly net operating income of this change?

Group of answer choices

$5,600

$3,600

$6,600

$9,600