Answer:
interest rate is 2.25 %
Explanation:
given data
sell bond = $715
bond matures = 15 years
redeem = $1,000
solution
we apply here formula that is
amount = principal × [tex](1+r)^{t}[/tex] ................1
here put value and we get
1000 = 715 × (1+r)^{15}
[tex](1+r)^{15}[/tex] = [tex]\frac{1000}{715}[/tex]
solve it we get
r = 0.022617
so rate is 2.25 %