The matter is not made easy by their claiming that they agreed on the interest rate of 13% when there was no such clause in the deed of legal mortgage and when it is a well-known fact which this court takes judicial notice of that interest rates are dependent of the policy on the Central Bank. No interest rate is static. It is not immutable. It varies depending on the nature of Government policy which follows the state of the economy.
– Pats-Acholonu, J.S.C. Pinder v. North (2004)