Answer:
21.11176754
Explanation:
storate cost: 0.30
as the storage is continusly we use continuos interest rate:
0.30 / 4 = 0.075 per quarter
this is paid in advance so we calculate the present values of this payment
[tex]PV = 0.075 + 0.075e^{-0.04 \times 0.25} + 0.075e^{-0.04 \times 0.50}+0.075e^{-0.04 \times 0.75}[/tex]
PV = 0.295552053
Now we solve for the future value of silver using also a continuos rate
[tex]F = (spot + storage) e^{0.04 \times 1}[/tex]
(20 + 0.295552053)e^0.04 = 21.11176754