The Ace Corporation manufactures bicycles. The production and market information in 2019 were as follows:

Market demand for Ace bicycles	12,000 units
Price and costs per bicycle
Selling price	$300
Variable manufacturing cost	200
Variable marketing cost	25
Allocated fixed costs	50
Machine hours required to produce 1 bicycle	0.5 hrs.

* Total machine hours available: 5,000 hours

The given information is expected to stay unchanged in 2020. However, Ace discovered an opportunity to rent another machine that can increase capacity by 2,000 machine hours at an additional rent expense of $40,000.

Required: Assuming that Ace Corporation rents the additional machine at $40,000 and there is no inventories either in 2019 or 2020, calculate how much operating income would increase(decrease) from 2019 to 2020 if Ace maximizes profit.

Input a positive number for increase in income, whereas a negative number (with a minus sign) for decrease.