Let's say I expect SPY to bounce at $100. Instead of putting out $10k for a position in the ETF, I buy 1 call option. If price is currently trading at $110, how could I put that options order into the market now, so it's ready should SPY drop to $100? How can I predetermine actual risk/reward of the option? I know I want to be in SPY at $100, with my stoploss at $95 and my profit target at $107.50. How can I make sure my option offers the same risk/reward?