Please help me solve the following question with steps on how to do it. I already have the answers, I just need someone to explain in clear steps on how to do this problem.

1) A condensed income statement for Tramco follows: (amounts are in thousands of dollars)

Products	F	G	H	Total
Sales (total)	$200	$180	$320	$700
Unit-level Variable Cost (total)	(120)	(160)	(200)	(480)
Contribution Margin	80	20	120	220
Facility-Level Fixed Cost	(25)	(30)	(40)	(95)
Income (Loss)	$ 55	$(10)	$ 80	$125

Tramcos management is considering whether to discontinue manufacturing product G at the beginning of the next year. Doing so will have no effect on total fixed costs and no effect on the sales or variable costs of products F and H. The change in income that would result from discontinuing product G is?

Ans: $20,000, decrease