Percentage of city B employees ride bus to work is
where x is the % of people who ride bus to work out of population p in City A.
Explanation:
We have , the percentage of city employees who ride the bus to work is 10% higher in City B than in City A,. In order to find what percentage of city employees in city B ride the bus to work? , let us assume that employees in city A is x . Number of employees in city B is 10% more than city A , i.e.

which is equivalent to
. Therefore, Percentage of city B employees ride bus to work is
where x is the % of people who ride bus to work out of population p in City A.