Question

In 2020, there were about 260 million gas powered cars on the road. This number isexpected to decrease at a rate of 1.1% per year. In 4 years, if this information iscorrect then what is the best prediction of the number of people driving gaspowered cars? Round answer to a whole number. Do not include units.

Answer 1

This is an equation of exponential decay

y(t) = a b^ t where a is the initial amount

b is the decay factor

t is the time in years

b is found by taking 1 and subtracting the percent it decreases in decimal form

Letting t =4

y(t) = 260 million * ( 1- .011) ^ 4

=248.7473796 million

=24874737.96

Rounding to a whole number

= 24874738