A certain substance is formed in a chemical reaction. The mass of substance formed $t$ seconds after the start of the reaction is $x$ grams. At any time the rate of formation of the substance is proportional $\left( {20 - x} \right)$. When $t = 0$, $x = 0$ and $\frac{{dx}}{{dt}} = 1$.
a) Show that $x$ and $t$ satisfy the differential equation
$\frac{{dx}}{{dt}} = 0.05\left( {20 - x} \right)$.
b) Find, in any form, the solution of this differential equation.
c) Find $x$ when $t = 10$, giving your answer correct to 1 decimal place.
d) State what happens to the value of $x$ as $t$ becomes very large.
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