Not far off:
130,000 basic
2,000 - 3000 per month for overtime (average) = 30,000
20,000 per year retention bonus.
= 180,000 ish per year, this is if everything works out o.k. though and you work overtime every month (not a problem at the moment) and they continue to pay the FULL retention bonus (which they have so far). Problem is that you can't rely on this continuing.