Answer:
The rate at which to discount the payments to find sum borrowed is 12.68%
Step-by-step explanation:
The discount rate to be used in computing the sum borrowed can e derived from the effective annual rate formula below:
Effective annual rate = (1 + Quoted interest rate/m)^m - 1
quoted interest rate is 8.40
m is the number of months in a year when compounding is done which is 12
effective annual rate=(1+8.40%/12)^12-1
effective annual rate=(1+0.01)^12-1
effective annual rate=(1.01)^12-1
effective annual rate=1.12682503 -1
effective annual rate=0.12682503=12.68%