exam Maths Puzzle Numerical Ability

Enrique puts 12% of his monthly paycheck in an IRA IF he invests $72 in his IRA, how much was his paycheck?

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exam Other Question

simplify: ( -2y^3/5)^3

solving I get 8y^9/5 if I simplify is it -2y^9/5? Solve:(A) (1/27)sqrt3^x=81(^x-1)/9
(B) (cubedsqrt4/2)^6x=2sqrt2
I am worried that I have not typed (B) correctly but if someone could even help me with(A) I would appreciate it .