exam Maths Puzzle Numerical Ability

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exam Other Question

Simplify [(3/4)^2 - (1/3)^3] * 3^2

(3^2/4^2) - (1^3/3^3) * 3^2
9/16 - 1/27 *9

I am not sure if i am headed in the right direction. Is this simplified? Or do i have to solve? Thank you Solve for t

62.5(1.0038)^t=76.5(1.003)^t

Please show the steps!
thanks so much, cathy