ANSWER:
67.4%
STEP-BY-STEP EXPLANATION:
To know how much could be saved, we must calculate the amount that would have been spent in the 21 months paying the $ 21, like this:
[tex]21\cdot21=441[/tex]We calculate what this value represents with the expense value, like this:
[tex]\frac{441}{1354}=0.326[/tex]The value saved would be 1 minus the value that represents the payment of the policy for 21 months:
[tex]1-0.326=0.674\rightarrow67.4\text{\%}[/tex]The savings percentage is 67.4%