73. From past surveys and records, an orchard owner in  northern Michigan has determined that if 26 apple trees per acre are planted , each tree yields 500 apples on average the yield decreases by 10 apples per tree for each additional tree planted . How many trees should planted per acre to achieve the maximum total yield?
Sub- Math
Level- Pre-calc.
Chepter-Polynomial and Rational functions
 I went to a tutor and I saw sweat on his teeth.. Please if you can ... help...