9. A car manufacturer currently makes 1000 cars each week.
The manufacturer plans to increase the number of cars it makes each week.
The number of cars made will be increased by 20 each week from 1000 in week 1, to 1020 in week 2, to 1040 in week 3 and so on, until 1500 cars are made in week \(N\).
- Find the value of \(N\).
The car manufacturer then plans to continue to make 1500 cars each week.
- Find the total number of cars that will be made in the first 50 weeks starting from and including week 1.