Calculate the nominal and effective rate of interest for the following ordinary annuity. Determine the nominal interest rate whose compounding interval equals the payment interval. 
Definitions:
Pelicans
Large water birds known for their distinctive pouches under their beaks, belonging to the family Pelecanidae.
Incompletely Divided Ventricles
A heart condition where the ventricular septum does not completely separate the left and right ventricles.
Middle-Ear Bones
The three small bones in the mammalian ear - the malleus, incus, and stapes - that transmit sound vibrations from the eardrum to the inner ear.
Alveoli
Small air sacs in the lungs where gas exchange between the air and blood takes place, crucial for breathing.
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