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Math·Advanced Math·Nonlinear functions

hard

A quantity decreases by 20% every 5 seconds. If the initial value of the quantity is 340, which function f(x) represents the value of the quantity after x seconds?

A

$f(x)=340(0.2{)}^{5x}$

B

$f(x)=340(0.8{)}^{5x}$

C

$f(x)=340(0.2{)}^{\frac{x}{5}}$

D

$f(x)=340(0.8{)}^{\frac{x}{5}}$