Based on common packaging for single-use or small-load options in Pakistan, your query for Ariel Detergent Powder 50 pk most likely refers to a small, single-use sachet/pouch.

However, the search results show that Ariel often sells its detergent in small packs of 30g (which might be bundled) or 40g as its lowest weight, or in 500g pouches. A specific 50g single pack is sometimes seen for various local brands, but Ariel's smallest confirmed single pack is often 30g or 40g, or sold in a multi-pack of 50 units (a "50 pk").

Here is the most relevant information:

Ariel Detergent Powder (Small Pack/Sachet) in Pakistan (PK)