Im sorry but your answer is incorrect. Here is the real solution:

Cost of Shares = $10,000
Transaction amt = $10
Investment = $10,010

When calculating real-time dollars, you must include the $10 in your % of increase/decrease.

Hence =

$10,010  +  50% = $15,015

$15,015 – 40% = $9,009

To sell the shares, you need to subract an additional $10 for transaction fees.

= $9.009 – $10 = $8,999

Actual Loss = $10,010 – $8,999 = $1,011

Dat investor got played homeboi. Rasdawg out \m/