Question

Rain forests are home to $90,000$ of the $2,50,000$ identified plant species in the world. What percent of the world’s identified plant species are found in rainforests?

Answer 1

Hint: In order to find the percentage of the world’s identified plant species that are found in rainforest, first find the number of identified plants species that is present in the rain forests, and then find the number of identified species that are present in the world, divide them to get the fraction, and then multiply it to $100$, to get the percentage.

Complete step-by-step answer:
We are given the statement that there are $90,000$ identified plant species that are present in the rain forests.
Therefore, the value becomes $90,000$, numerically written as:
Value $ = 90,000$ ………. (1)
 And, it’s also given that the total identified plant species that are present in the world is $2,50,000$.
Therefore, the total value becomes $2,50,000$, numerically written as:
Total Value $ = 2,50,000$ ………. (2)
From the percentage formulas we know that we can find the percentage of a value by dividing the value by the total value and then multiplying the fraction obtained with $100$.
So, according to this, dividing equation 1 by equation 2, and we get:
$\dfrac{{{\text{Value}}}}{{{\text{Total Value}}}} = \dfrac{{90,000}}{{2,50,000}}$
Solving the fraction to its simplest form and we get:
$\dfrac{{{\text{Value}}}}{{{\text{Total Value}}}} = \dfrac{9}{{25}}$
Now, multiplying the fraction with 100, to get the percentage:
$\left( {{\text{Percentage}}} \right)\% = \dfrac{{{\text{Value}}}}{{{\text{Total Value}}}} = \dfrac{9}{{25}} \times 100\% $
$ \Rightarrow \left( {{\text{Percentage}}} \right)\% = \dfrac{9}{{25}} \times 100\% $
Solving the terms:
$ \Rightarrow \left( {{\text{Percentage}}} \right)\% = 9 \times 4\% $
$ \Rightarrow \left( {{\text{Percentage}}} \right)\% = 36\% $
Therefore, $36\% $ per cent of the world’s identified plant species are found in rainforests.
So, the correct answer is “$36\% $”.

Note: If needed we can also convert the fraction into decimal then multiplying it by 100, both will result the same answer. For example, we can write $\dfrac{9}{{25}}$ as $\dfrac{9}{{25}} = 0.36$ then multiplying 100, we get:
 $\left( {{\text{Percentage}}} \right)\% = 0.36 \times 100\% = 36\% $.
And, the results are the same.