Given:
Daniel bought a bicycle for $80 and a helmet for $20.
Sales tax = 5%
To find:
The total amount of both items including tax.
Solution:
Price of bicycle (excluding tax)=
Price of helmet(excluding tax) =
Price of both items =
=
Now, the sales tax is 5%. So,
Price of both items (including tax) =
=
=
Therefore, the Daniel pays $105 for the two items, including tax.