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fix(curriculum): combined sentences and added examples (#60858)

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Co-authored-by: Ilenia <26656284+ilenia-magoni@users.noreply.github.com>
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curriculum/challenges/english/25-front-end-development/lab-currency-converter/67eaa957114d373deb3a9149.md
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@ -15,8 +15,24 @@ demoType: onClick
1. Your `CurrencyConverter` component should render an `input` element to accept the amount to be converted from.
2. Your `input` element should accept numbers.
3. Your `CurrencyConverter` component should render two `select` elements to choose the currency to convert **from** and **to**.
4. Your `select` element should include options for **at least** `USD`, `EUR`, `GBP`, and `JPY`.
1. You may use any exchange rate, provided there is no one-to-one mapping between the currencies.
4. Your `select` element should include options for **at least** `USD`, `EUR`, `GBP`, and `JPY`. You may use any exchange rate, provided there is no one-to-one mapping between the currencies. Here are some examples of good and bad mappings:
```js
const badMapping = {
USD: 1,
EUR: 1,
GBP: 1,
JPY: 1
};
const goodMapping = {
USD: 1,
EUR: 0.92,
GBP: 0.78,
JPY: 156.7
};
```
5. Your `CurrencyConverter` component should memoize the calculation of the converted amounts for the **from** currency such that a change in the **to** `select` option will not recalculate the converted amounts.
6. Your `CurrencyConverter` component should render an element showing the converted amount in the format `XX.XX CCC`, where `XX.XX` is the converted amount and `CCC` is the currency code.
7. The converted amount should be rounded to two decimal places.