#### Answer

$\$ 3679.09$

#### Work Step by Step

We are given:
$A_{p}=50000, i= \frac{0.08}{2}=0.04, n=10*2=20$
The present value of an annuity is given by:
$A_{p}=R \frac{1-(1+i)^{-n}}{i}$
We solve for $R$:
$R= \frac{iA_{p}}{1-(1+i)^{-n}}:$
$R=\frac{(0.04)(50000)}{1-(1+0.04)^{-20}}=\$ 3679.09$