How to prove up an amount of $$

In a dispute about a DTPA exemption for transactions involving “more than $100,000,” the following testimony was sufficient to establish that amount. In addition to a business-records proveup of attached records, by affidavit, the witness “testified she directly supervised PMRG property managers, including supervision of the calculation and collection of rent and other amounts due from tenants under their leases in the building; produced or supervised the production of a ‘record of account,’ attached as exhibits to her affidavit, showing rent and other amounts appellants owed to Landlord under the Lease . . . .” And “[m]oreover, [she] testified in her deposition that she and ‘accounting’ reviewed the reconciliations relating to appellants’ bills before they went out. [And she] further testified records of ‘actual invoices or bills’ were in the ‘general ledger,’ which ‘shows every expense that was billed to that property throughout the year.'” Lakepointe Pharmacy v. PM Forney MOB LP, No. 05-16-01413-CV (Aug. 14, 2018) (mem. op.)