I think it is depend on the market condition and the support and resistance level.I set the stop loss and take profit option depending on the support and resistance level.set the next support for the stop loss or take profit option.But i think it is very big to take 100 pips risk only for 10 pips.When you will lose your one trade then you need 10 trade for recovering it.So every trader should use 50:50 for stop loss and take profit.