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Answer:
13 years
Step-by-step explanation:
Given data
A=50,000
P=20,000
r= 7%
t=??
The compound interest formula is given as
A=P(1+r)^t
Calculate time, solve for t
t = ln(A/P) / r
t= ln(50000/20000)/0.07
t= ln(2.5)/0.07
t= 0.916/0.07
t= 13.0
Hence the time is 13 years