2007-10-23 09:30:27 · 8 answers · asked by hell raiser9392 2 in Science & Mathematics ➔ Mathematics
There are two ways to get this:
1. If you're taking 20% off (NOT "off of")### an original price, the balance that's left is 80% of the original.
80% x $49 = 0.80 x $49 = $39.20.
2. The other (and somewat more tedious way) is to calculate 20% of the original price,
20% x $49 = 0.20 x $49 = $9.80,
and then SUBTRACT that from the original price of $49.
$49.00
- 9.20
______
$39.80
I prefer the first approach --- it's easier to check that the subtraction of the original percentage from 100% is correct, and it also means that I don't have to bother with doing a subtraction in $ terms later.
Live long and prosper.
### Re. "off of" : This is a common mistake; it would (or SHOULD!) offend your English teacher.
2007-10-23 09:33:26 · answer #1 · answered by Dr Spock 6 · 1⤊ 0⤋
20 % = 0.20 as a decimal
With a 20% discount, you are paying 80%. ie 20% + 80 % = 100%
Therefore 0.80 * 49 = 39.20
2007-10-23 09:38:21 · answer #2 · answered by Jim M 3 · 0⤊ 0⤋
.20 * 49 = 9.80
49 - 9.80 = 39.20 is the price with the %taken off
2007-10-23 09:38:53 · answer #3 · answered by Ms. Exxclusive 5 · 0⤊ 0⤋
$10 or there about
2007-10-23 09:35:05 · answer #4 · answered by Elfie 2 · 0⤊ 0⤋
10% = 4.9 x 2 = $9.80 - that's 20%
$49 - $9.80 = $39.20
Are you a student in a class?
2007-10-23 09:35:47 · answer #5 · answered by CJ 2 · 0⤊ 0⤋
$4.90 is ten percent off and add another $4.90 for 20 percent which is $9 .80
Subtract
$49.00
- 9.80
______________
equals $ 39.20 plus add tax!
2007-10-23 09:41:47 · answer #6 · answered by Bonnebelle 5 · 0⤊ 0⤋
49.00 X .20=9.80
49.00-9.80= 39.20
39.20 is your answer
2007-10-23 09:41:28 · answer #7 · answered by Anonymous · 0⤊ 0⤋
39.20 PLUS TAX
2007-10-23 09:38:09 · answer #8 · answered by Princess 2 · 0⤊ 0⤋