distance of charges from center
r = sqrt ( a^2 + b^2) / 2
r = sqrt ( 32^2 + 68^2) / 2
r = 37.58 cm
now electric potential at center of the rectangle
V = k ( q1 / r + q2 / r + q3 / r )
V = 9*10^9* ( 31 + 31 - 30)*10^-6 / 0.3758
V = 7.66*10^5 V
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Comment in case any doubt, will reply for sure. Goodluck
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