That's 'gross payment' according to your bill not 'costs'. I clearly defined what I meant by cost, so you are just being ignorant at this time.
"Gross Payments" you say??? Here's the section of the bill dealing with the receipt required. Where do you see the term "gross payments"?
"`(a) In General- For each purchase of taxable property or services for which a tax is imposed by section 101, the seller shall charge the tax imposed by section 101 separately from the purchase. For purchase of taxable property or services for which a tax is imposed by section 101, the seller shall provide to the purchaser a receipt for each transaction that includes--
`(1) the property or services price exclusive of tax;
`(2) the amount of tax paid;
`(3) the property or service price inclusive of tax;
`(4) the tax rate (the amount of tax paid (per paragraph (2)) divided by the property or service price inclusive of tax (per paragraph (3));
`(5) the date that the good or service was sold;
`(6) the name of the vendor; and
`(7) the vendor registration number."
To most people the "cost" in your context would be what one pays for the thing ... which would be the total price (t-i). IOW, out of pocket price.