Suppose you invest in 130 shares of Merck (MRK) at $40 per share and 130 shares of Yahoo (YHOO)at $25 per share. If the price of Merck increases to $45 and the price of Yahoo decreases to $22 per share, what is the return on your portfolio?
A. 9.23%
B. 3.08%
C. 4.15%
D. 4.92%