Coins are often used to express a fraction of a currency. In the US, a quarter is $0.25 and a dime is $0.10. Counting change is just one of many ways you can put decimals to use in everyday life.

The price for sending a package at the post office varies by the weight of the package according to the following table:

\[\begin{align} \text{Weight of Package (kg)} &&\text{Price (dollars)}\\ \text{Under 1 kg} &&\text{1}\\ \text{1 kg or more and under 3 kg} &&\text{1.5}\\ \text{3 kg or more and under 5 kg} &&\text{2}\\ \text{5 kg or more and under 10 kg} &&\text{2.5}\\ \text{10 kg or more} &&\text{3} \end{align}\]

If Leonard sends a package which consists of one \(0.5\text{ kg}\) pen, three \(0.1\text{ kg}\) postcards, and two \(0.8\text{ kg}\) booklets, how much will he have to pay at the post office?

What is the perimeter of a rectangle whose width is \(3.3\) and length is \(6.3?\)

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