Which equation has a constant of proportionality equal to 101010? Choose 1
Choose 1

(Choice A)
A
y=\dfrac{2}{20}xy=
20
2

xy, equals, start fraction, 2, divided by, 20, end fraction, x

(Choice B)
B
y=\dfrac{30}{3}xy=
3
30

xy, equals, start fraction, 30, divided by, 3, end fraction, x

(Choice C)
C
y=\dfrac{12}{2}xy=
2
12

xy, equals, start fraction, 12, divided by, 2, end fraction, x

(Choice D)
D
y=\dfrac{5}{5}xy=
5
5

xy, equals, start fraction, 5, divided by, 5, end fraction, x

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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