An arborist examined trees in an orchard to see if they were infected with a virus. 10 out of 40 trees were infected with the virus. what percentage of the trees were infected? write your answer using a percent sign (%).

25 % of trees are infected.

Step-by-step explanation:

It is given that there are 40 trees in total.

Out of these 40; 10  are infected with virus.

The ratio of number of trees infected to number of trees in total is given by,

= = = 0.25

The percent form is given as,

=

=

=

= 25 %

Thus, number of trees infected are 25%.