Answer:
Return on Stock Q is 11.85%
Step-by-step explanation:
Investment in Q = ($63,500 - $16,900 - $24700)
Investment in Q =21900
Portfolio return = Respective return * Respective investment weight
13.3= (16900 / 63500 * 18.1%) + ( $24,700 / $63,500 * 11.3% ) + ( $21900 / $63,500 * Return on Q)
13.3 = 4.817165354 + 4.39533071% + (21900 / 63500*Return on Q)
13.3 = 9.21259843% + (21900 / 63500*Return on Q)
Return on Q = (13.3% -9.21259843%) *63500/21900
Return on Q = (4.08740157 * 2.899543379)
Return on Q = 11.85159816%
Return on Q =11.85%