Where shall I put the value of ”Price” in the formulae

Hello tom,
Thank you for your reply.
Could you please let us know where shall I put the value of ” Price” in the formulae

[math_round precision="0"]x*[product_meta key="_weight"]*1.15[/math_round]

“Product value = round(Price * Product Weight * 1.15,0)
I think
Product weight = _weight
math_round is for rounding of he value.
confused about the Price.

Looking forward to hearing from you soon. Thank you.