For this case we have a function of the form:
[tex]y = A * (b) ^ x
[/tex]
Where,
A: it is the initial amount
b: is the growth rate
x: it's time
Substituting values we have:
[tex]y = 12880 * (1.30) ^ x
[/tex]
For 20 days we have:
[tex]y = 12880 * (1.30) ^ {20} y = 2447839[/tex]
Answer:
the amount will be 2447839 pounds in 20 days