This is the best summary I could come up with:

Prior to a top-up arrangement introduced by then treasurer Scott Morrison in 2017, WA's share had slumped to 30 cents in the dollar.

But economists Saul Eslake and Chris Richardson independently reviewed the plan and concluded the deal will actually cost about $50 billion over that time period.

Ms Saffioti vigorously defended WA's GST deal at a Chamber of Commerce and Industry breakfast in Perth on Tuesday.

Mr Eslake's report is blunt in its assessment of the GST deal, calling it "the worst public policy decision of the 21st century."

WA Liberal Leader Libby Mettam called on Premier Roger Cook to seek a written agreement from the federal government promising it won't backflip on the deal.

"There are issues of trust and Western Australians deserve a written ironclad guarantee that Labor's position will not change on the GST," she said.

The original article contains 602 words, the summary contains 140 words. Saved 77%. I'm a bot and I'm open source!