To estimate the price of the 2015 Porsche 718 Cayman V6 3.4L Standard with 116500 km mileage, I considered the listed price of a similar 2014 Porsche 718 Cayman V6 3.6L Standard with 135000 km mileage, which is SAR 84000. Given that the 2015 model is a year newer and has slightly lower mileage, I adjusted the price upwards. Additionally, the engine size difference (3.4L vs 3.6L) is minor but could slightly affect the price. Considering these factors, I estimated the price to be slightly higher than the listed 2014 model.