We would apply the formula for determining compound interest which is expressed as
A = P(1 + r/n)^nt
where
A = total amount after t years
P = principal or initial amount
r = interest rate
n = number of compoundings per year
t = number of years
From the information given,
P = 20000
r = 7.5/100 = 0.075
t = 5
n = 12 because it was compounded 12 times in a year
Thus,
A = 20000(1 + 0.075/12)^12 * 5
A = 20000(1.00625)^60
A = 29065.89
The worth of the bond in 5 years would be $29065.89