9514 1404 393
Answer:
 $342.37
Step-by-step explanation:
When a quantity is marked up by x%, its marked-up price is (1 +x/100) times its original price. Tax is effectively a markup.
Louise's costs are ...
 $125 + (12.50 +19.50)(1.07) = $159.24
Louise priced her painting at ...
 $159.24·(1 +1.15) = $342.37