A Zhao Jia pin.

Solution: The salary income of employees recruited by Company A in the nth year is:10000+200 (n-1) = 9800+200 n;

The salary income of employees recruited by Company B in the nth year is: 5000× 2+50× (2n-1) = 9950+100n;

It can be seen from the above: ∵ When 9800+200n=9950+ 100n, n= 1.5,

From the applicant's point of view,

When the working time is greater than or equal to 1.5 years, it is beneficial to choose a company.

When the working time is less than 1.5 years, it is advantageous to choose company B.

Hope to adopt! thank you