An item originally costs $10
It's on sale for 50% off with and additional 20% off
If the sales tax is 10.1%, what is the final cost of this item?
(Please help I will mark brainliest)

Plz 20 points polynomials 1: subtract and simplify (–y^2 – 4y – 8) – (–4y^2 – 6y + 3) 2: multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2 3: multiply and simplify (x – 4) (x2 – 5x – 6)