After the introduction of a 10% GST, the cost of an item of clothing (which is previously was untaxed) increased to $48. What was the old cost of the article?

if it is now $48 and you want to find the original price, the easiest method is simply divide it by 11 and then multiply by 10, as in the diagram above

$48 ÷ 10 × 11
= $43.64