How to find reverse percentage increase in javascript

Asked Feb 19 '18 at 06:35

Active Feb 19 '18 at 09:35

Viewed 55 times

I have two variable as below

var Price = 100;
var DiscountRate = 3;

I calculate percentage of Price variable

After the calculation process, the result looks like below

I want to reach 100 when I increase 3% from 97 afterwards.But when i increase the number 97 by 3%, i get a figure of 99

How can i do this by using javascript ?

Any help will be appreciated.

edited Feb 19 '18 at 09:35

Arihant Jain

asked Feb 19 '18 at 06:35

Soner

1

Why do you get the 3% from 97. It should be the 3% of 100 so 3 + 97 = 100. – Dencio Feb 19 '18 at 06:38
1

I really think this question was marked as a duplicate too soon… but it does sounds like a math problem more than a javascript problem? – thgaskell Feb 19 '18 at 06:41
1

Increase of 3% on top of 97 is 99.91, so while display decimal are truncated or you have removed them. Formula to get 100 is (y*100)/(100-x) Y is the current value and x is the discount (97*100)/(100-3) = 100 – Arihant Jain Feb 19 '18 at 06:42
@Dencio because Price is 97 in database so if i increase %3 it should give me 100 – Soner Feb 19 '18 at 06:55
@ArihantJain what about %15 from 100 ? Value is 85 if you increase %15 it displays 97,75 how can i find 100 now ? – Soner Feb 19 '18 at 06:56
1

put same values in formula (85*100)/(100-15) = 8500/85 = 100 – Arihant Jain Feb 19 '18 at 06:58
1

@SonerSevinc its a math question and formula is correct. – Arihant Jain Feb 19 '18 at 07:01
@ArihantJain if you answer i will accept best answer thanks my friend – Soner Feb 19 '18 at 07:02
1

@SonerSevinc the formula should be price = 100 / (100 - discount) * discountedPrice. – Dencio Feb 19 '18 at 07:28

0 Answers0