28.6 No set-off by Obligors
All payments to be made by an Obligor under the Finance Documents shall be calculated and be made without (and free and clear of any deduction for) set-off or counterclaim.
28.7 Business Days
(a) Any payment under the Finance Documents which is due to be made on a day that is not a Business Day shall be made on the next Business Day in the same calendar month (if there is one) or the preceding Business Day (if there is not).
(b) During any extension of the due date for payment of any principal or Unpaid Sum under this Agreement, interest is payable on the principal or Unpaid Sum at the rate payable on the original due date.
28.8 Currency of account
(a) Subject to paragraphs (b) and (c) below, US dollars is the currency of account and payment for any sum due from an Obligor under any Finance Document.
(b) Each payment in respect of costs, expenses or Taxes shall be made in the currency in which the costs, expenses or Taxes are incurred.
(c) Any amount expressed to be payable in a currency other than US dollars shall be paid in that other currency.
28.9 Change of currency
(a) Unless otherwise prohibited by law, if more than one currency or currency unit are at the same time recognised by the central bank of any country as the lawful currency of that country, then:
(i) any reference in the Finance Documents to, and any obligations arising under the Finance Documents in, the currency of that country shall be translated into, or paid in, the currency or currency unit of that country designated by the Agent (after consultation with the Borrower); and
(ii) any translation from one currency or currency unit to another shall be at the official rate of exchange recognised by the central bank for the conversion of that currency or currency unit into the other, rounded up or down by the Agent (acting reasonably).
(b) If a change in any currency of a country occurs, this Agreement will, to the extent the Agent (acting reasonably and after consultation with the Borrower) specifies to be necessary, be amended to comply with any generally accepted conventions and market practice in the Relevant Market and otherwise to reflect the change in currency.