Answer:
Given condition: Shalika bought a purse for $120 and the tax rate is 9%.
As per the given condition;
The amount of the purse is, $120.
Tax rate =9%
First find the the total tax she paid on the amount is equal to the 9% of $120 i.e,

Now,
Total amount paid by Shalika = $120 +$10.8 = $130.8