Answer:
30600 less 25 000 = 5600
increase in net income
Explanation
1400 units 1000 units
sales 224 000 160 000
(1400*160) (1000*160)
variable costs (106 400) (48 000)
(1400*76) (1000*48)
contribution margin 117 600 112 000
fixed costs (87 000) (87 000)
net operating income 30 600 25000