一台笔记本电脑的售价为 $2675。 学生可以以 $2140 的折扣价购买这台笔记本电脑。 计算给学生价格的折扣百分比。 答：... % 学生价格 $2140 包含 7% 的消费税（GST）。
计算笔记本电脑在计入消费税之前的学生价格。 答：... 一名学生决定以分期付款的方式购买这台笔记本电脑。
笔记本电脑的现款价为 $2140。
该学生支付了现款价 10% 的首付款，并进行 36 个月等额月付。
在 36 个月结束时，笔记本电脑的分期付款总价为 $2500。
计算每月付款的金额。 答：$ ...

1. Find the discount amount from the original selling price and student price.

Discount $= 2675 - 2140 = 535$

2. Express the discount as a percentage of the original selling price.

Percentage discount
$= \frac{535}{2675}\times 100\% = 20\%$

1. Recognise the inclusive price as 107% of the price before GST.

Since the price includes $7\%$ GST,
$\text{inclusive price}=100\%+7\%=107\%$
So $2140 is $107\%$ of the price before GST.

2. Find the price before GST by reversing the 7% increase.

$\text{Price before GST}=2140\div 1.07=2000$

1. Calculate the deposit paid as 10% of the cash price.

Deposit $=10\%\times 2140$

$=0.10\times 2140$

$=\char36{}214$

2. Find the total amount to be paid through the 36 monthly payments.

Amount paid by monthly payments

$=2500-214$

$=\char36{}2286$

3. Divide the remaining amount equally by 36 to find each monthly payment.

Monthly payment $=2286\div 36$

$=\char36{}63.50$