In the first test case,

At floor 1, two employees will get in and the total weight will be 100
At floor 2, one employee of weight 50 will leave and two employees each of weight 50 will get in. Total number of employees will become 3 and total weight will be 150
At floor 3, two employees each of weight 50 will leave and two other employees of weight 20 and 10 will get in. Total number of employees will become 3 and total weight will become 80
The elevator will be able to reach floor number 4 without encountering an overload situation.

The answer is 4.

In the second case,

At floor 1, two employees of weight 50 and 50 will get in which will create an overload situation as both the number of employees and total weight is exceeding the maximum limit. So, the elevator will stop at floor number 1

The answer is 1