Final answer:
The phone plans will be equal in cost after 14 months.
Step-by-step explanation:
To determine when the phone plans will be equal in cost, we need to set up an equation. Let the number of months be represented by 'x'. For Plan A, the total cost would be 630 + 40x (one-time fee plus monthly service). For Plan B, the total cost would be 350 + 60x. We can set these two expressions equal to each other and solve for x:
630 + 40x = 350 + 60x
Subtracting 40x from both sides gives us:
630 = 350 + 20x
Subtracting 350 from both sides gives us:
280 = 20x
Dividing both sides by 20 gives us:
x = 14
Therefore, the phone plans will be equal in cost after 14 months.
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