In an experiment, equal amounts of water and sand were heated under a lamp. The initial and final temperatures of each were recorded. A partial record of the temperature is shown. Experimental Record
Substance Initial Temperature Final Temperature
Sand 20 °C 26 °C
Water 20 °C ?

Which statement about the final temperature of the water is correct?

1. It will be less than 26 °C as sand has a relatively higher specific heat than water.
2. It will be less than 26 °C as water has a relatively higher specific heat than sand.
3. It will be more than 26 °C as sand needs relatively higher energy than water to raise its temperature.
4. It will be more than 26 °C as water needs relatively higher energy than sand to raise its temperature.

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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