Spark Brothers electricians have been hired to do the rough wiring work for a homebuilder in a new development. The Sparkbrothers took $80$ hours to do the rough wiring for the first home they worked on and $70\mathrm{.}4$ hours to do the rough wiring in the second home. Using learning curve theory, how long will it take them to remodel the $10$th store?

Question $3$ options:

$70\mathrm{.}4$ hours

$52\mathrm{.}32$ hours

$56\mathrm{.}38$ hours

$265\mathrm{.}75$ hours

$2\mathrm{.}92$ hours