Respuesta :
Toad Population = 80000
Rate of shrink = 9.2% = 0.092 => 100 - 9.2 = 90.8% = 0.908
Time t = 20 years
Toad population after first year = 80000 x 0.908 = 72640
Next year will be 72640 x 0.908 = 65957.12
This for 20 years lead up to 80000 x (1 - 0.0.092)^20 = 80000 x 0.908^20 = 11609