Answer:
decrease by $16,000
Step-by-step explanation:
We know that, 
The net income = Sales - variable cost - fixed expense 
The sales = Sales units × selling price per unit 
 = 50,000 boxes × $25
 = $1,250,000
The variable cost = Sales units × variable cost per unit 
 = 50,000 boxes × $17
 = $850,000
And, the fixed cost is $260,000
So, the net income would equal to
= $1,250,000 - $850,000 - $260,000
= $140,000
Since, the sales units are increased by $24,000 units, so new sales units is 74,000 units 
And, the sales per unit is decreased by 2 So, new sales per unit is $23 
So, the new sales 
= Sales units × selling price per unit 
= $74,000 × $23 = $1,702,000
The variable cost = Sales units × variable cost per unit 
So, the new variable cost equals to 
= 74,000 units × $17
= $1,258,000 
And the fixed expense would increased by the $60,000 so new fixed cost is $320,000
So, the new net income would be equal to 
= $1,702,000 - $1,258,000 - 320,000
= $124,000
If we compare these two net income, then the difference would be
= $140,000 - $124,000
= $16,000 decrease