Answer Happy

Solve this first-order differential equation word
problem.
This should I have a linear differential equation. I need
help obtaining the second answer. If anything looks unclear,
let me know.
а a A nitric and solution flows at a Censtand rate it 6l/min into large 0.5 % nitric acid solution. The solution tank that initially held 200 L A mode the tank, is kept wen stirred of of 8 e/on. If the solution entering the tank is 20% nitric acich determine after of mind when will the porcentage and in tank grown oo-- (3.98 107 1100-74 L 19.96 min