Question

Mai bought a television for $325. The tax rate is 8%.

Which proportion can be used to find the amount of tax Mai will pay?

Answer 1

8/100 = x/35?

Answer 2

I would write 8% as a fraction
and tax/total_price as the other fraction
(we could call tax "x", for unknown)

Answer 3

\[\frac{ 8 }{ 100 } = \frac{ x }{ 35 }\]

Answer 4

what is 35 ?

Answer 5

err 325 not 35

Answer 6

ok, that makes more sense

Answer 7

x = 26

Answer 8

yes, the tax is 26

Answer 9

so the way to cross multiply is the way i did it? or is it a different way?

Answer 10

people learn "cross multiply" but the easiest way is this
\[ \frac{ 8 }{ 100 } \cdot \cdot 35= \frac{ x }{ 35 } \cdot 35 \]
the idea is if you multiply the right side by 35, the 35/35 turns into 1
but to keep things equal, multiply the left side by 35 also

Answer 11

like \[\frac{ 8 }{ 325 } = \frac{ x }{ 100 }~ or~ \frac{ 8 } { 325 } = \frac{ 100 }{ x }\]

Answer 12

oh ok and it is 325 not 35.

Answer 13

so
\[ x = \frac{8}{100} \cdot 35 \]

Answer 14

ok thanks for the help.

Answer 15

fan / medal

Answer 16

\[ \frac{ 8 }{ 325 } = \frac{ x }{ 100 }~ or~ \frac{ 8 } { 325 } = \frac{ 100 }{ x } \]
these don't make a lot of sense to me
I would think: 8% means 8 out of 100 , or more exactly
8 dollars of tax divided by 100 dollars of cost
so I would write a ratio of tax divided by cost
8/100
and
x (unknown tax)/ 325 (known cost)

Answer 17

oh ok :) thanks again @phi