something that pains my brain help!!!hate math!!?

Question

If you buy a music CD for$33 VIP, you know that $30 was the cost of the CD and $3 was the VAT, because 3 is 10% of 30
How much VAT is included in the price of a CD that costs: $39

Answer 1

10% is Vat
so price+ VAT= price+ (price10/100) = 39$
110/100 price= 39
then price is 3900/110 =34.54
Vat is 10% of it
then 34.54 10/100= 3.45$ is VAT

Answer 2

its not very difficult actually..

look, $39 is the cost of the cd plus vat.
originally the price of the cd is $y (100%) and vat is 10%
so , you can say that $39 is 110%.

$39 = original price + vat
$39 = 100% + 10%
$39 = 110%
$39 / 110 = 110% / 110
$39/110 = 1%
($39/110) x 10 = 1% x 10
$39/11 = 10%
$3.5454 = the vat!

hope you can understand...

Answer 3

well, it's kinda clear that you guessed the first question.

I've got a of ways I'd like you to try.

So, 3 is 10% of the original amount of $30
3/33 = 1/11
which means, the VAT is 1 part out of 11
So, 1/11*39 = 39/11 = 3.5454...

Answer 4

enable the selection be abcd. a million. the 1st digit is one-third of the third digit. 1b3d 2b6d 3b9d 2. The fourth digit is two situations the 2nd digit. a1c2 a2c4 a3c6 a4c8 3. the 1st digit and the third digit upload as much as two times the sum of the 2nd digit and fourth digit. including first and third 1b3d = 4 2b6d = 8 3b9d = 12 two times the sum of 2d and 4th. a1c2 = 6 a2c4 =12 a3c6 =18 a4c8 = 24 3924

Answer 5

If the VAT = 10% 10% of $39.00 = $3.90 = VAT

(39.00 times 00.10 = 3.90)

$39.00 - $3.90 = $35.10 (the cost of the CD before VAT)

Answer 6

I use T for total price, P for selling price, and t for tax.
Then
T = P + t
but t = 0.1P
so P = t/0.1
T = t/0.1 + t
T = t(1/0.1 + 1)
T = t(1 + 0.1)/0.1
t = 0.1T/1.1
for T = $39
t = 0.1*39/1.1
t = $3.55