Based on the fact that your friend will give you 2 cards extra in addition to your 20 Pokémon cards after three months, the annual rate of interest she is willing to pay is 46.41%
The annual rate of interest can be found by finding out the number of periods that your friend takes to return the cards in terms of a year.
As this is in months, the annual rate of interest can be found as:
= (Ending value / Beginning value) ^ number of months in year / number of months your friend had your cards - 1)
Solving gives:
= ((20 + 2) / 20) ¹² / ³ - 1
= 46.41%
Find out more on annual rates at https://brainly.com/question/2699966
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