The increased cost for the 4 bonds purchased today, based on The Wall Street Journal's quoted values (Bonds=NJ 4.125% 35, Current yield=2.3%, Volume=5, Close=109.875%, Net change=+1.125%), is $790.16.
Let's break down the steps to calculate the increased cost for the 4 bonds purchased today:
Calculate the face value of one bond:
![\begin{aligned}& \text { Face Value }=\frac{\text { Annual Interest }}{\text { Current Yield }} \\& \text { Face Value }=(4.125 \% * 100)/(2.3 \%) \\& \text { Face Value } \approx (4.125)/(0.023) \\& \text { Face Value } \approx 179.35\end{aligned}](https://img.qammunity.org/2023/formulas/mathematics/college/3ovhcy2f92d0v617t22sstv3t8u5wgc5io.png)
Calculate the cost of one bond purchased today:
![\begin{aligned}& \text { Cost of One Bond }=1.09875 * \text { Face Value } \\& \text { Cost of One Bond }=1.09875 * 179.35 \\& \text { Cost of One Bond } \approx 197.54\end{aligned}](https://img.qammunity.org/2023/formulas/mathematics/college/q1pswfohmf2xd38hu4ittcxm18tokpv34w.png)
Calculate the increased cost for the 4 bonds purchased today:
![\begin{aligned}& \text { Increased Cost }=4 *\text { Cost of One Bond } \\& \text { Increased Cost }=4 *197.54 \\& \text { Increased Cost }\approx 790.16\end{aligned}](https://img.qammunity.org/2023/formulas/mathematics/college/vgv0nho7ohnnihwi3zkp7w0y8thmjc4t28.png)
Therefore, the increased cost for the 4 bonds purchased today is approximately $790.16. Rounded to the nearest cent, the answer is $790.16.