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I have this question on my homework and I came up with -3300; the correct answer

ID: 2652117 • Letter: I

Question

I have this question on my homework and I came up with -3300; the correct answer is -4100....can someone please help me with what I did wrong? I think I don't understand what "S" is or how to solve for "S":

((3*1100)-800)-(3*{S})

Jetson is entering his senior year as an accounting major and has a number of options for his summer break. His options for the 3 month break follow:
(1) Work full time at a local accounting firm making $2,200 per month.
(2) Take a summer class which will cost $800 and work half time making $1,100 per month.
(3) Take a class at a cost of $800 and not work at all during the summer.

Jetson's incremental profit or loss if he chooses option 2 over option 1 would be?

Explanation / Answer

6,600  

[2200*3]

3,300

[1100*3]

so Incremental benefit (loss) of option 2 over option1 = $ -4,100

option 1 option 2 Incremental Income

6,600  

[2200*3]

3,300

[1100*3]

-3,300 cost - -800 -800 Incremental benefit 6600 2500 -4100