BRUSSELS, April 19 (Reuters) - Apple's ( AAPL ) offer to

open its tap-and-go mobile payments system to rivals is set to

be approved by EU antitrust regulators as soon as next month

after it tweaked some of the terms, people familiar with the

matter said.

Apple's ( AAPL ) bid to settle the four-year investigation would help

it dodge a finding of wrongdoing and stave off a potential hefty

fine that could be as much as 10% of its global annual turnover.