Saudi-based National Commercial Bank has said the kingdom will book a SR91bn ($24.3bn) surplus in 2010 based on an average oil price of $75 per barrel, and will avoid a deficit if prices stay above $60, Reuters has reported. The kingdom may end up spending 12% above the SR540bn it budgeted for 2010, and get revenues 48% above the planned SR385bn, Said al-Shaikh, chief economist at NCB said.