Question

A watch costing $80 is on sale for $56. Find the discount rate.

Answer 1

find how much percent is 56 of 80

Answer 2

a - %a = b

a = original price
b = sales price

80 - %80 = 56

80 - 56 = %80

24 = %80
24/80 = %
.3 = %

30 = %

Answer 3

@Hero answer is in case where it says 30% off.
my answer is when it says: " now only 70%"

Answer 4

The discount rate is definitely not 70%

Answer 5

:( i'm confused

Answer 6

it depends on what you understand by discount rate....

Answer 7

I used percent as a variable. That's probably why you're confused.

Answer 8

@myko, 70% is not the discount rate.

Answer 9

80*0.7=56
80-(80*0.3)=56

Answer 10

i'm confused about all of it. I thought u had to set it up as S=C-rC

Answer 11

Right, @myko, notice that discount means to "subtract", where in your case, you have "multiplied", rather than subtract.

Answer 12

maybe...:) I don't go much shopping...:)

Answer 13

@joyce153, your formula is the same as mine

S = b
C = a
r = %

Answer 14

Wikipedia says:
Rate (mathematics), a specific kind of ratio, in which two measurements are related to each other
@Hero

Answer 15

@myko, why are you telling me things I already know?

Answer 16

You must never have heard of the term percentage rate.

Answer 17

sry, didn't whant to barden you...

Answer 18

?

Answer 19

Here, we're only looking for the discount rate. I provided the steps necessary to solve the problem above @joyce153

Answer 20

so i write it like this?
56=80-80r

Answer 21

Yes, that's how you start off.

Answer 22

Now, you have to isolate r

Answer 23

i did 56-80=80-80-80r
-24=-80r
-24/-80=-80r/-80
& i got 3.3=r

Answer 24

It would be better if you add 80r to both sides, then subtract 56 from both sides to get

80r = 80 - 56

Then get

80r = 24

Then divide both sides by 80 to get

r = 24/80

That reduces to

r = 3/10 which is the same thing as 30/100 or 30%

Answer 25

@szemespeter, we don't use commas as decimals in America.

Answer 26

did 56-80=80-80-80r
-24=-80r
-24/-80=-80r/-80
& i got 3.3=r

you were doing ok until the last line
-24/-80 = 0.3 so
0.30 = r

now change 0.30 to percent by multiplying this fraction by 100
you get 0.30*100= 30%

Answer 27

@phi how did u get 0.3 from -24/-80? Because when I put that in the calculator it =3.333333333

Answer 28

if anyone ells can answer that Q let me know.

Answer 29

You either inputted something wrong or you need to re-calibrate your calculator.

Answer 30

ok i was doing -80 div -24=3.333333333
-24/-80=3/10

Answer 31

type this into the google search window:
24/80=

as a sanity check, notice that 80/80 is 1, so 24/80 is smaller than 1
240/80 = 3

how you get 3.3333 is a total mystery.

Answer 32

what is div ?

Answer 33

\[\div\]

Answer 34

ohh, you did it upset down!

Answer 35

ok i think get it now!!

Answer 36

ok i got it now!! THX!!!

Answer 37

Wait a second, I help you with the question, but you give phi the medal? :/

Answer 38

i can't give u both a medal or i would.