Book Maths Puzzle Simple & Compound Interest

Find the balance of the account. The problem is: $3,800 principal earning 2% compounded quarterly after 7yrs.


I understand how to figure an equation that earns annually but not sure what # to use for quarterly interest
Tk you

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Book Other Question

If you were 12 years old and your brother was 19 years old how old are both of you in 48 years? what does the word "geometry" mean?