Answer:
It will take 30.10 year
Explanation:
We have given initial investment $500000
Future value = $ 1 million = $1000000
Rate of interest r = 1.79 %
We have to find the time taken to reach the amount $1000000
We know that future value is equal to 
Taking log both side
n×0.0077 = 0.3010
n = 39.09 year
Now in second case rate of interest
r = 2.34 %
So 
taking log both side
log 2 = n log 1.0234
n×0.01 = 0.3010
n = 30.10 year
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I believe the answer is a circut breaker
Cost = $4,000
Revenues = $3,200 per year
Life = 5 years
Payback period calculation:
Year ----- Cash flow -------- Investment
Yr 0 ----- ------------ -4,000
Yr 1 ------ 3,200 ----------- -800
Yr 2 ------ 3,200 -------------- 0
Payback period lies between year 1 and 2.
Therefore,
Payback period = 1+ 800/3200 = 1+0.25 = 1.25 years
