It's good to ask first, my third trip to Sosua I agreed to pay a barber 150 pesos for a haircut, when I got out of his chair, after a shave also, he demanded 700 pesos, I was peeved and gave him 600 pesos, later finding out the going rate is 100 pesos, inclusive.... One motor concho demanded 400 pesos for an intown ride, with one quick stop to get a phone number, I gave him 40 pesos, because that was double to 4 times the current rate at that time. So, I always ask and if you are not familiar with whoever are doing what, it can be problem. Americans and Dominicans sometimes are expected to pay different prices. And I hate to have that heated discussion when i'm in the barbers chair getting a shave with a straight razor, which did happen to me once.