Answer:
The lender should use 4%, semi-annual rate in order to calculate the amount of interest it will receive in cash.
Step-by-step explanation:
Since RUSS Inc. has already borrowed money at a 4%, semi-annual note from a family friend, it is irrelevant what the market rate is after RUSS has taken the loan. RUSS Inc. will pay and the lender will receive interest on the mutually agreed rate according to their agreement.