阿什拉夫（Ashraf）起初有一些钱。他把其中的 15% 花在食物上，并花了 $810 买了一台新笔记本电脑。然后，他把剩下钱的 20$304。

1. Determine the percentage of the remainder that Ashraf had left in the end

Percentage of remainder left = $100\% - 20\% = 80\%$

2. Calculate the amount given to his brother (which is 20% of the remainder)

$80\%$ of remainder $\rightarrow \char36{}304$
$20\%$ of remainder $\rightarrow \frac{\char36{}304}{4} = \char36{}76$

1. Find the total remainder before giving money to the brother

The brother received 20% of the remainder, so the $304 left represents 80$80% \text{ of remainder} = $304$$100% \text{ of remainder} = \frac{304}{80} \times 100 = $380$

2. Find the amount of money left after spending 15% on food

The remainder is what was left after spending 15% on food and $810 on a laptop. Amount after spending on food =$$380 + $810 = $1190$

3. Find the total amount of money at first

The amount after spending on food represents $100\% - 15\% = 85\%$ of the original amount.
$85\% \text{ of original amount} = \char36{}1190$
$100\% \text{ of original amount} = \frac{1190}{85} \times 100 = \char36{}1400$