2000 *( 1+x)* 50% *( 1+x/2)= 1320
The solution is x=0.2 or x=-3.2 (excluding, the growth rate cannot be -3.2).
The yield per hectare of new peanut varieties has increased by 20%
Just list the equations according to the meaning of the question, and then remove the unrealistic results.
By the way, we did this problem not long ago. It's too difficult.