The total amount of tax on her purchases to the nearest cent will be $9.97
Step-by-step explanation
Marcella Heinz purchased office supplies for $107.64 and then she purchased an English-Spanish dictionary for $16.95
So, the total amount of her purchases

On the total amount of the purchases, she paid state sales tax of 7.5% and the county tax of 0.5%
So, the amount of the state sales tax

and the amount of county tax

Thus, the total amount of tax on her purchases
(Rounded to the nearest cent)