He planted 92 of those because 12 times 6 is 72 and 72 plus 20 is 92 therefore the answer is 92
20.38. C = pi * d, therefore, d=C/pi.
64/pi = 20.38
Monthly- $15,600
biweekly- $26,000
weekly- $28,600
semimonthly- $19,200
Im pretty sure these are correct. Monthly is obviously once a month, biweekly is once every two months. Weekly is once a month and semimonthly is twice a month.
You find how y and x change and then divide y/x to get your rate of change