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Capacitor/ will rate lifesaver immediately !

I cant get the last part

A capacitor consisting of two concentric spheres of radius R1 and R2 = 3.00·R1 has a capacitance of C = 8.00 picoFarads and is charged to a potential difference of88.0 Volts. Calculate the energy stored in the capacitor.
3.10×10-8 J

Calculate the charge on this capacitor, when the electrical energy stored is 27.5·10-8 Joules.
2.10×10-9 C

If the radius of the outer sphere is increased by a factor of 2.00 while keeping the charge on the plates constant, by what factor does the stored energy change?

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