On 1 April, you purchased 300 shares of GameStop (GME) at $100 per share on margin. There was a 50% initial margin, which you paid in cash. The price rose to $120 per share, and you closed out your position at this price (i.e., sold the shares and paid off the margin loan). Your broker charges $10 per trade. Assuming there were no other costs or taxes (e.g., margining costs or additional capital for margin calls), what was your holding period return on this investment?