Using data in a car magarine, we constructed the mathematical model

$y=100e^{-0\mathrm{.}0863}$

for the percent of cars of a certain type still on the road ather tyears. Find the percent of cars on the road ather the following

a$.)0$

b$.)5$

Then find the rate of change of the percent of cars still on the road after the following numbers of years.

c$.)0$

d$.)5$

a$)$ $ of cars of a certain byee are still on the road atter $0$ years.

$($Round to the nearest whole number as needed$)$