The owner of a music store ordered merchandise with a total value of $11000 from her supplier. She ordered CDs costing $10 each and DVDs costing $20 each. If she ordered 200 more CDs than DVDs, how many of each did she order?

500 CDs and 300 DVDs.

Step-by-step explanation:

Given:

The owner of a music store ordered merchandise with a total value of $11000 from her supplier.

She ordered CDs costing $10 each and DVDs costing $20 each.

If she ordered 200 more CDs than DVDs.

Question asked:

How many of each did she order?

Solution:

Let number of DVDs ordered by her =

Then the number of CDs ordered by her =

Cost of 1 CD = $10

Cost of   CDs =

Cost of 1 DVD = $20

Cost of DVD =

Total value of her ordered = $11000

Cost of   CDs + Cost of DVDs = $11000

Number of DVDs ordered by her = = 300

Number of CDs ordered by her = = 300 + 200 = 500

Therefore, she ordered 500 CDs and 300 DVDs from her supplier.

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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