How Much Does It Cost if My Car's Oil Leaks

Recently, my car's oil leaks so bad that within minutes the oil tank is empty. Thank God that the car workshop is nearby. When asked about how much will it cost to repair it, the mechanic told us about RM200. We ended up paying RM190 but I felt it is a lil bit pricey because they only change the oil seal (that looks like a piece of thick black rubberband) and top up the gear oil. They did not even top up the engine oil. Hubby told me that their workmanship is quite expensive. Next time, if we have a choice, we won't return there to repair our car.