"earn decent" is not correct and cannot be used in written English.
However, you could use "earn a decent wage" in a sentence. For example: "He was able to support his family after he began to earn a decent wage."
To earn decent profits firms have to keep cutting costs, so contributing to further price falls.
You can work in almost any destination, and earn decent money.
By concentrating on narrower markets and serving mainly domestic clients they should still be able to earn decent enough returns.
They are also trying to fine-tune their network spending so they can more-or-less break even on providing basic access.So how can they earn decent returns?
Two decades ago an investment bank could buy a telephone and earn decent margins by quoting bond or currency prices to ignorant customers.
When capital was plentiful, banks could go into businesses that were not particularly profitable but that might earn decent returns if magnified by debt.
I earned decent money in England.
We are in a decent profession, earning decent money, to support decent families".
"Afghani migrant earns decent wage in Spain!" will never make the cut.
Every day over four-dozen men who previously had no job are earning decent living wage.
"It was aimed at people earning decent money and who are financially secure.
