An exponential function W such that

W(t) = W₀e^kt

for

k > 0

describes the first month of growth for crops such as maize, cotton, and soybeans. The function value

W(t)

is the total weight in milligrams,

W₀

is the weight on the day of emergence, and t is the time in days. It is often difficult to measure the weight

W₀

of a plant from when it first emerges from the soil. If, for a species of cotton,

k = 0.21

and the weight after 10 days is 700 milligrams, estimate

W₀.

(Round your answer to two decimal places.)