Let the normal electricity price be X, and the peak and valley electricity prices are x +0.03 and x-0.25 respectively.

So 60*( x +0.03 )+90*(x-0.25 )=66.3 to solve x=0.58.

Therefore, the peak-valley electricity price is x +0.03=0.6 1, and the valley electricity price is x-0.25 =0.33.

If the new time-of-use electricity price policy is not implemented, the extra electricity fee paid by Xiaoming's family in April is 0.58*(60+90)=87.