EoSB calculation in case of working in different branches of the same group

Hi,

Good evening,

Initially, I was being appointed in a Dubai-based company and they transferred me to Qatar.

I worked 10 years in Qatar and again they transferred me to Dubai and I worked for 3 years. Then after that, they transferred me to owners' personal company in Dubai and I worked for 5 years.

I worked for a total of 18 years but my EOSB was never settled. Now, I got terminated and my present basic salary is AED 10,000/-.

How will my EOSB Gratuity calculation be?

Please help me understand.