Final answer:
The relative change in the percentage of city employees who ride the bus to work from last year to this year is -75.1% when rounded to the nearest tenth of a percent.
Step-by-step explanation:
To calculate the relative change in the percentage of city employees who ride the bus to work from last year to this year, you need to use the formula for relative change, which is:
Relative Change = ((New Value - Old Value) / Old Value) × 100%
In this case, the new value is this year's percentage (5.3%) and the old value is last year's percentage (21.3%).
Relative Change = ((5.3% - 21.3%) / 21.3%) × 100%
Relative Change = (-16% / 21.3%) × 100%
Relative Change = -75.1%
When rounded to the nearest tenth of a percent, the relative change is -75.1%.