Please show me the solution to this question i do not care f

Please show me the solution to this question. i do not care for the answer rather how to do it.

THE SECONDARY SIDE REACTANCE IS X2.

THIS SECONDARY REACTANCE REFERRED TO PRIMARY IS X2\'.

SO, X2\'=X2/(K^2.)

WHERE K IS THE TRANSFORMATION RATIO.

K=[N2/N1]=[I1/I2]=[V2/V1]=[E2/E1]

WE KNOW REACTANCE XC=1/(jwC)

X2\'=X2/(K^2)

X2\'=[N1/N2]^2*X2

SO, C2\'=[N2/N1]^2*C2

C2\'=[5/200]^2*C2

C2\'=(0.025)^2*C2

C2\'=0.625 nF.