Answer:
The gestation duration of rhinos (487 days) is 121.3 percent longer than that of bears (220 days).
Step-by-step explanation:
Given:
Gestation duration of rhinos = 487 days
Gestation duration of bears = 220 days
To Find:
Percentage increase =?
Solution:
The percentage increase can be found through 
By plugging in the values,
the result is 
=

= and leads to 
which is approximately 121.3 %