The price of fuel may increase due to demand and decrease due to overproduction. marco is studying the change in the price of two types of fuel, a and b, over time.
the price f(x), in dollars, of fuel a after x months is represented by the function below:
f(x) = 2.15(0.98)x
part a: is the price of fuel a increasing or decreasing and by what percentage per month? justify your answer. (5 points)
part b: the table below shows the price g(m), in dollars, of fuel b after m months.
m (number of months) 1 2 3 4
g(m) (price in dollars) 4.19 3.98 3.78 3.59
which type of fuel recorded a greater percentage change in price over the previous month? justify your answer. (5 points)

the answer is a

step-by-step explanation:

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

related questions

i believe the correct answer is b.