Genius Capital has $200 in capital. It goes long 20 shares of Computer Corp. (CC) at $10 per share and goes short 50 shares of Laptop Ltd. (LL) at $4 per share on the same day. One month later CC rises to $12.50 per share and LL rises to $5, and Genius Capital unwinds both trades. 

What percentage gain did Genius Capital make from this long/short trade on its $200 of capital? Assume no leverage and transaction costs.