Each pair of shorts cost $23.97, and the total if she bought 4 more shirts, would come out to $196.23.
$115.95 (Total cost) - $20.07 (Cost of t-shirt) = $95.88 (Cost of shorts)
$95.88 (Cost of shorts)/4 (Number of pairs) = $23.97 (Per pair of shorts)
Each pair of shorts cost $23.97.
$20.07 (Cost of 1 t-shirt)*4 (T-shirts) = $80.28
$115.95 (Original total) + $80.28 (Cost of 4 more T-shirts) = $196.23
The total if she bought 4 more shirts, would come out to $196.23