Comments on: How do you work out the original cost of a product given the new cost and the discount?

By: fordest

fordest — Wed, 10 Mar 2010 06:52:37 +0000

The easiest way is to use porportions.

You are paying 70% so

Always put the % paid over one hundred.
and the Discounted price over the original price

70/100=70/x

Cross mulitpy. 30x=7000
Solve for x
x=100 pounds

By: Joe K

Joe K — Wed, 10 Mar 2010 06:52:37 +0000

p = orig price

p – .3p = 70

p ( 1 – .3) = 70

p = 70 / (1 – .3)

p = 100

By: genius

genius — Wed, 10 Mar 2010 06:52:37 +0000

let x be original cost.r be rate of discount
new cost= x-discount=x – x*r/100
=x(1-r/100)
x=newcost/(1-r/100)
got it?

By: nysenutz

nysenutz — Wed, 10 Mar 2010 06:52:37 +0000

OK …subtract the discount percentage from 100. divide the new cost by the answer. Mutiply in by 100, and thats your original cost. BE aware that most retailers put a minimum of 100% mark up…so if they buy something for $50 they will sell in for $99.99. (say $100), therefore , after the 30% discount they are still making $20 on the sale.

By: reg

reg — Wed, 10 Mar 2010 06:52:37 +0000

new price = old price – (old price * discount rate)
70 = op – 0.3op
70 = op (1-0.3)
70 = op (0.7)
op = 70 /0.7
op = 100

By: elbiie

elbiie — Wed, 10 Mar 2010 06:52:37 +0000

£70=70% or 0.7
divide through by the percentage to get the original price
£70/0.7 = £100