Thank you for the opportunity to help you with your question!

We just need to use the following expression:

FV = PV(1 + (i/n) )^(n*t)

n is the times that is compounded (if it is semiannual then n = 2)

t is the number of periods (number of years)

i is the interest rate in decimal form

PV is the initial value or initial investment

FV is the future value (what we need to find)

Part a

So we would have:

PV = $20,000 ; i = 2% = 0.02 ; n = 2 ; t = 6 years

FV = (20,000)(1 + (0.02/2) )^(2*6) = (20,000)(1 + 0.01)^12 = (20,000)(1.01)^12 = 22536.5006

FV = $22536.50

Part b

t = 12 years

FV = (20,000)(1 + (0.02/2) )^(2*12) = (20,000)(1 + 0.01)^24 = (20,000)(1.01)^24 = 25394.69297

FV = $25394.69

Part c

t = 18 years

FV = (20,000)(1 + (0.02/2) )^(2*18) = (20,000)(1 + 0.01)^36 = (20,000)(1.01)^36 = 28615.37567

FV = $28615.38

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