book Maths Puzzle Numerical Ability

(1/cx^2-4c+dx^2-4d+2/cx+2c+xd+2d)/((3/x^2-4)-(4/xc+xd-2c-2d)

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book Other Question

Calculate the return A if the bank compounds daily (n=365)
20,000 & 8% (n=365)
This is what I have so far:
A= 20,000 ( 1+.08/365) 365*3
A= 20,000 (1.00)^1095
= ?

Thanks, Christine What is (2 - 3i)(1 - 4i)?