Discount rates, Formulas

Question

for example, I have 1 computer with a discount, the price of this computer is $ 450 with a 10% discount, I want to know the real price of it, I want to learn this both over 10% and as 10% money.

Computer 10% off Price = 450$
Computer $10 off Price = 490$

$net_total = 450;
$discount_value = 10; < percent or amount
$gross_price =  ?;

Dmitry Bychenko · Accepted Answer · 2021-10-30T13:31:50.080

0

Well, let's solve the equations:

Computer 10% off Price = 450$
Computer $10 off Price = 490$

Which can be written as (let x be the initial price of the computer)

x - x * 10 / 100 = 450  # initial price - x without 10 % from x - x * 10% / 100%
x - 10 = 490            # just 10$ off

Or

0.9 * x = 450
x = 500

Finally

x = 450 / 0.9 = 500
x = 500

So from both equations we have that the initial computer's price is 500$

Edit: in general case,

if $discount_value stands for per cent (i.e. $discount_value = 10 means 10% discount) then

 $gross_price = $net_total * 100.0 / (100.0 - $discount_value)

if $discount_value stands for money (i.e. $discount_value = 10 means 10$ discount), then

 $gross_price = $net_total + $discount_value

edited Oct 30 '21 at 13:31

answered Oct 30 '21 at 13:08

Dmitry Bychenko

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Updated the question, could you please edit it? – lidersin Oct 30 '21 at 13:13
When I do as you say, the result is wrong. – lidersin Oct 30 '21 at 13:20
`const x = (item.net_total -item.net_total*item.discount_value/100);` Finally 405 :s – lidersin Oct 30 '21 at 13:21
@lidersin: in order to find *initial price* (?) `x` you should not *subtract*, but *add*: `initial = net + off` – Dmitry Bychenko Oct 30 '21 at 13:37
teacher are you there – lidersin Nov 12 '21 at 09:52
[link](https://stackoverflow.com/questions/69941237/find-the-real-price-at-the-percentage-applied-price) **can you help me?** – lidersin Nov 12 '21 at 10:16

Discount rates, Formulas

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