Sure, let's complete the invoice step-by-step, rounding to the nearest cent as needed:
First, let's calculate the list price for each item:
1. Notebooks:
- Quantity: 20
- Unit price: [tex]$1.63
- List price: \( 20 \times 1.63 = \$[/tex]32.60 \)
2. Looseleaf paper:
- Quantity: 40
- Unit price: [tex]$0.89
- List price: \( 40 \times 0.89 = \$[/tex]35.60 \)
3. Ballpoint pens:
- Quantity: 15
- Unit price: [tex]$0.71
- List price: \( 15 \times 0.71 = \$[/tex]10.65 \)
Next, we sum up the list prices to get the total list price:
[tex]\[ \$32.60 + \$35.60 + \$10.65 = \$78.85 \][/tex]
Now, apply the 20% trade discount:
[tex]\[ 20\% \text{ of } \$78.85 = 0.20 \times 78.85 = \$15.77 \][/tex]
Finally, subtract the discount from the total list price to get the net price:
[tex]\[ \$78.85 - \$15.77 = \$63.08 \][/tex]
Here's the completed invoice:
\begin{tabular}{|c|c|c|c|}
\hline Qty & Item & Unit price & List price \\
\hline 20 & Notebooks & [tex]$\$[/tex] 1.63[tex]$ & $[/tex]\[tex]$ 32.60$[/tex] \\
\hline 40 & Looseleaf paper & [tex]$\$[/tex] 0.89[tex]$ & $[/tex]\[tex]$ 35.60$[/tex] \\
\hline 15 & Ballpoint pens & [tex]$\$[/tex] 0.71[tex]$ & $[/tex]\[tex]$ 10.65$[/tex] \\
\hline & & Total list price & [tex]$\$[/tex] 78.85[tex]$ \\
\hline & & 20\% trade discount & $[/tex]\[tex]$ 15.77$[/tex] \\
\hline & & Net price & [tex]$\$[/tex] 63.08$ \\
\hline
\end{tabular}
