The table shows the percentage of a bacterial species in a hospital that was resistant to a particular antibiotic in two different years.
| Year | Resistant bacteria / % |
|---|---|
| 2010 | 12 |
| 2020 | 30 |
Calculate the percentage increase in the proportion of resistant bacteria between 2010 and 2020.
[2]
Explain why the proportion of resistant bacteria increased over this period.
[3]