Interpreting the text: Unanimous means all. Why is it important that this word was used?

Its important because it shows that everyone was in agreement

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