Question

At a coin collector's shop, a rare US coin was recently marked up 50% and is now selling for $210.00. How much was the coin before the mark-up?

Answer 1

$140 is the answer

Answer 2

`140\\` $

Explanation:

Let the original price of US coin be "X"

The mark up in the price of US coin
`= 50 \\` %

Price of US coin after mark up

`= X + ( (50)/(100) X)\\= 1.5 X\\`

`1.5 X = 210\\X = (210)/(1.5) \\= 140\\`$