John knows that his first 4 test grades were 84,79,82,88. Find John’s grade on the fifth test if his average was 83.8

The fifth grade is 86

Step-by-step explanation:

Given that there are five grades, let the missing fifth grade be represented by x:

84 +79 +82 +88 + x /5 = 83.8

333 + x/5 = 83.8

Next, we cross multiply:

333 + x = 83.8 x 5

333 + x = 419

Subtract 333 from both sides of the equation to get the value of x

333 + x - 333 = 419 - 333

x = 86

b is the final answer! : )

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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