To estimate the price of the 2014 Mercedes E350 V6 3.5L Standard with 144000 miles, I considered the listed prices of similar cars. The listed prices are: SAR 72500 for a 2014 model with 133500 miles, SAR 43000 for a 2014 model with 156000 miles, SAR 52000 for a 2013 model with 131500 miles, and SAR 68500 for a 2015 model with 225800 miles. The average of these listed prices is (72500 + 43000 + 52000 + 68500) / 4 = 59000 SAR. Given the car's average condition and mileage, I adjusted the price slightly below the average to account for potential negotiation and condition.