There are a total of 90 trees in Citrus Grove.
36 of them are orange trees.
Then the percent of the orange trees is given by
![(36)/(90)*100\%=40\%](https://img.qammunity.org/2023/formulas/mathematics/college/ddhynmxvvopy1bu4msuepy68izt2hdtxbh.png)
Divide the number of orange trees by the total number of trees and then multiply the answer by 100.
Therefore, 40% of the trees grow oranges.