The following table shows gas prices at one station, based on the number of months since January 2015. Months since January 2015, x 0 12 24 36
Price of Gas (dollars per gallon), y 2.45 3.25 3.12 3.06

If the curve of best fit for the data is y = -0.0012x2 + 0.065x + 2.45, what is the expected price per gallon in January 2019?

A. $2.63 per gallon
B. $3.25 per gallon
C. $2.81 per gallon
D. $3.33 per gallon

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

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