 Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program  and write your own code 
This challenge introduces using JavaScript callback functions as arguments to D3 methods. Since D3 is a JavaScript object, it has no problem following the same syntax rules
* All of the methods are chained together. Since `data()` and `enter()` precede the `text()` method, the following method calls will be for each datum and executed separately
*`select('body')` targets the 'body' element of the HTML document
*`selectAll('h2')` targets the existing 'h2' nodes that are children to the 'body' element
*`data(dataset)` tells D3 that the data to be used is held within the variable `dataset`
*`enter()` returns placeholder nodes for each datum that has no corresponding DOM element in the selection
*`append('h2')` turns these placesholders in to 'h2' elements
*`text((d) => d + ' USD')` uses JavaScripts callback functionality to insert each datum, `d`, as the text for each 'h2' node created previously and concatenates the required ' USD'
*`select('body')` targets the 'body' element of the HTML document
*`selectAll('h2')` targets the existing 'h2' nodes that are children to the 'body' element
*`data(dataset)` tells D3 that the data to be used is held within the variable `dataset`
*`enter()` returns placeholder nodes for each datum that has no corresponding DOM element in the selection
*`append('h2')` turns these placesholders in to 'h2' elements
*`text((d) => ```${d} USD```)` uses JavaScripts callback functionality to insert each datum, `d`, as the text for each 'h2' node created previously. It also makes use of JavaScript template literals to avoid string concatenation
##  NOTES FOR CONTRIBUTIONS:
*  **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
* Add an explanation of your solution.
* Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. 
* Please add your username only if you have added any **relevant main contents**. ( **_DO NOT_**_remove any existing usernames_)
> See  <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.
