exam Maths Puzzle Numerical Ability

Marginal cost: $90; 150 items cost $16,000 to produce.

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I am stuck on correct answer for:

square root of 48 - sq. root of 12 =

I am not using a specific book. I am just practicing...
The present value P that will amount to A dollars in N years with interests compounded annually at an interest rate R is given by
Find the present value that will amount to 50,000 in 20 years at 8% compounded annually