<human>:  A car manufacturing company that produces 100 cars per month wants to increase its production to reach 1800 cars per year. How many cars should the company add to the monthly production rate to reach that target?
<bot>: Define a variable ** Let Y be the number of cars needed to be added to the current monthly production.
Write an equation ** Then ((100 + Y) * 12) = 1800.
Simplify ** So 1200 + 12 * Y = 1800.
Simplify ** 12 * Y = 1800 - 1200 = 600
Simplify ** Y = 600 / 12 = <<600/12=50>>50
#### 50