生产一张沙发的成本是 S$1500。它以成本的 15% 的利润卖给零售商。 计算零售商购买该沙发所支付的价格。 答：S$ ... 在一次家具展销会上，零售商随后以 S$2250 的价格将该沙发卖给了一位顾客。计算零售商销售该沙发的利润占售价的百分比。 答：...% 约翰（John）在银行将 S$3500 兑换成美元（US$），准备去美国旅行。回国时，他的钱包里还剩 US$78。 下表显示了他回国时该银行新加坡元（S$）与美元（US$）之间的汇率。 计算他去美国旅行所花费的新加坡元（S$）金额。 答：S$ ...

1. Increase the cost price by 15% to find the price paid by the retailer.

Profit $=15\%$ of S$1500

Price paid by retailer
$=1500+15\%\times1500$

$=1500+0.15\times1500$

$=1500+225=1725$

1. Find the retailer's profit from selling the sofa.

From part (a)(i), the retailer paid S$1725 for the sofa.

Profit $= 2250 - 1725 = 525$

2. Express the profit as a percentage of the selling price.

$\frac{525}{2250} \times 100\% = 23.333\ldots\%$

$\approx 23.3\%$

1. Find the Singapore dollar value of the US\$78 left over.

Since John is changing US dollars back to Singapore dollars, use the bank's buying rate.

$\text{Value of US\$78}=78\times 1.34=104.52$

So the amount left over is S$104.52.

2. Subtract the value of the unspent money from the original amount changed.

$\text{Amount spent}=3500-104.52=3395.48$