exam Maths Puzzle Numerical Ability

How to calculate compound rate of interest for a deposit of Rs.10000 Placed for 5 years and the interest compounded on quarterly basis. Table given below

Period(in months)

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exam Other Question

Can you help me figure out what to do here? The problem is: (x+y)(2x-1)(x+1)
Thanks
2log(x)=log(3x/4)-1