Hey I need help with my calc homework. Please help me.

Write the differential equation (unlimited, limited, or logistic) that applies to the situation described. Then use its solution to solve the problem. A wildlife refuge is initially stocked with 100 deer, and can hold at most 800 deer. If 5 years later the deer population is 200, nd a formula for the deer population after 1' years. (Round your coefficients to two decimal places.) y: Use your answer to estimate when the deer population will reach 400. (Round your answer to the nearest whole number.) yr