I check the zero-cost backspread P/L graph to figure the strike. For example, stock at 100, 100 strike is $3, 110 strike is $2. Zero-cost backspread is 1 ATM for 2 110. The 2 110 will break even with the ATM at 120. If stock is expected to be over 120 at expiration, then the 110 options will be...