一家公司在为期 5 天的促销活动中以 20% 的折扣提供了 150 台笔记本电脑。折线图显示了每天结束时未售出的笔记本电脑数量。

1. Determine the number of laptops sold on each day by finding the difference in unsold laptops from the previous day

Number of laptops sold on Day 1: $150 - 150 = 0$
Number of laptops sold on Day 2: $150 - 130 = 20$
Number of laptops sold on Day 3: $130 - 40 = 90$
Number of laptops sold on Day 4: $40 - 20 = 20$
Number of laptops sold on Day 5: $20 - 20 = 0$

2. Identify the day with the highest number of laptops sold

The highest number of laptops sold is $90$, which occurred on Day 3.

1. Find the number of laptops sold on the first 2 days

Number of laptops unsold at the end of Day 2 = $130$
Number of laptops sold on the first 2 days = $150 - 130 = 20$

2. Calculate the percentage of laptops sold on the first 2 days

Percentage = $\frac{20}{150} \times 100\% = \frac{2}{15} \times 100\% = \frac{40}{3}\% = 13\frac{1}{3}\%$

1. Determine the number of laptops sold during the sale and after the sale

From the graph, the number of laptops left unsold at the end of Day 5 is $20$.
Laptops sold during the sale = $150 - 20 = 130$.
Laptops sold after the sale = $20$.

2. Calculate the original price of the laptop

The discounted price during the sale is $20\%$ off, which is $80\%$ of the original price.
$80\% \rightarrow \char36{}1288$
$1\% \rightarrow \char36{}1288 \div 80 = \char36{}16.10$
Original price ($100\%$) = $16.10 \times 100 = \char36{}1610$

3. Calculate the price of the laptop after the sale

After the sale, the discount is $50\%$.
Price after sale = $50\%$ of $\char36{}1610 = \char36{}805$

4. Calculate the total amount of money collected

Money from laptops sold during the sale = $130 \times \char36{}1288 = \char36{}167440$
Money from laptops sold after the sale = $20 \times \char36{}805 = \char36{}16100$
Total money collected = $\char36{}167440 + \char36{}16100 = \char36{}183540$