SOLUTION: Julia is starting her own on-line business selling jewellery that she makes. It cost her $3000 to buy a new computer, and her monthly expenses for Internet service and materials av

Question 975639: Julia is starting her own on-line business selling jewellery that she makes. It cost her $3000 to buy a new computer, and her monthly expenses for Internet service and materials average about $170 per month. If her revenue for each month averages about $420, how long will it be before she starts to earn a profit?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
The equation for costs is

where t is measured in months.
The equation for revenues is,

Profit equals revenue minus costs,
Find when P reaches zero.

So in the 13th month from starting she'll have a profit.

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