a $30-$year fixed$-$rate at $8\mathrm{.}5\%$ or a $20-$year fixed$-$rate at $8\%?$ How much is saved in interest?

Select the correct choice below and fill in the answer box within your choice.

$($Do not round until the final answer. Then round to the nearest thousand dollars.$)$

A$.$ The $20-$year $8\%$ loan is more economical. The buyer will save approximately $ in interest.

B$.$ The $30-$year $8\mathrm{.}5\%$ loan is more economical. The buyer will save approximately