English translation: interest agreements on the principal sum
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Explanation: ... of the foreign-currency loans of Norwegian companies
renteaftale: interest-rate agreement
A Google search yielded this definition:
Interest rate agreement
An agreement whereby one party, for an upfront premium, agrees to compensate the other at specific time periods if a designated interest rate (the reference rate) is different from a predetermined level (the strike rate).
Hovedstol: principal (of loan), principal sum, principal amount - US: capital sum
(L&H Business Fag Ordbog)