Work from Item W to Item X, then sum all four prices.
\\(\begin{aligned}
\text{Item W} &= \$125
\\
\text{Item Z} &= \$125 \times 1.20 = \$150 \quad (20\% \text{ more})
\\
\text{Item Y} &= \$150 \times 1.60 = \$240 \quad (60\% \text{ more})
\\
\text{Item X} &= \$240 \times 0.75 = \$180 \quad (25\% \text{ less})
\\
\text{Total} &= \$125 + \$150 + \$240 + \$180 = \$695
\end{aligned}\\)
Final Answer: \$695