Answer:
Explanation:
value is decreasing so rate should be <1
f(x)=Pr^x
=1250 (0.8)^x
if x=1
f(1)=1250(0.8)^1=1000 $
if x=2
f(2)=1250(0.8)^2=800 $
if x=3
f(3)=1250(0.8)^3=640 $
so D is the correct answer.
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