Ecologists use a formula to estimate the age of ancient boundary hedges based on the diversity of species:
Estimated age (years)=(mean number of woody plant species per 30 m)×120+25\text{Estimated age (years)} = (\text{mean number of woody plant species per } 30\text{ m}) \times 120 + 25Estimated age (years)=(mean number of woody plant species per 30 m)×120+25
The table below shows the data collected from five different hedges:
| Hedge | Mean number of woody plant species per 30 m30\text{ m}30 m |
|---|---|
| A | 1.8 |
| B | 2.5 |
| C | 3.4 |
| D | 4.2 |
| E | 2.1 |
Calculate the estimated age of the hedges in Hedge C.