Answer:
$14,194
Step-by-step explanation:
Wy + Wx = 1
Wy*Ry + Wx*Rx = 12.5%
So, let input the values
Wy*8.1% + (1-Wy)*14.3% = 12.5%
Wy*8.1% + 14.3%-14.3%*Wy = 12.5%
14.3%*Wy - Wy*8.1% = 1.8%
Wy*6.2% = 1.8%
Wy = 0.2903
Weight of X in portfolio = 1 - 0.2903
Weight of X in portfolio = 0.7097
Money invested in stock X = $20,000*0.7097
Money invested in stock X = $14,194