# EXP

The EXP function returns e raised to the power of a given number. This is the reverse of ln, the natural logarithm of number.

### Syntax

EXP(value) - > number

### Arguments

<table><thead><tr><th width="139.33333333333331">Arguments</th><th width="238">Datatype</th><th>Description</th></tr></thead><tbody><tr><td>value</td><td>Number, Node reference</td><td>The exponent applied to the base e. This is a required argument.</td></tr></tbody></table>

### Example&#x20;

Consider a scenario where we have the 2020 population figures of 5 major cities. Our goal is to estimate the population in the year 2030 assuming an average growth rate of 2%.

<table data-header-hidden><thead><tr><th width="132"></th><th></th><th></th><th></th><th></th><th></th></tr></thead><tbody><tr><td>City</td><td>New York</td><td>London </td><td>Hongkong</td><td>Toronto</td><td>Los Angeles</td></tr><tr><td>2020 population</td><td>8804190</td><td>9002488</td><td>7960000</td><td>3998747</td><td>6197000</td></tr><tr><td>Growth rate</td><td>0.02</td><td>0.02</td><td>0.02</td><td>0.02</td><td>0.02</td></tr><tr><td>Duration</td><td>10</td><td>10</td><td>10</td><td>10</td><td>10</td></tr></tbody></table>

To achieve this, the following formula should be written in the \[2030 population] node:

**`[2020 population]*`**<mark style="color:blue;">**`EXP`**</mark>***`([`*****`Growth rate]*[Duration])`**

### Result

| 2030 population |
| --------------- |
| 10753461.95     |
| 10995663.67     |
| 9722365.955     |
| 4884080.615     |
| 7569032.892     |


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