help help help yr10 maths homework

howdy, heres my problem.

Plastec makes automatic sprinkler system part for a landscaping company called evergreen systems.

the manager of plastec determinds that the set up costs will be $3500 and that each part will cost $1.80

to make. evergreen systems pays plastec $1000 to start the line of business and will pay $2.20 for each part thereafter.

using the information above I managed to determine that the cost, C, and revenue, R, equations were as follows if (n) was the number of parts made....

C = 3500 + 1.80n

R = 1000 + 2.20n

How do I find the breakeven point algebraically????

Please help!!!!

an answer and/or an explanation on how to do it would really help!

need really soon(Time)

Thanks!