In the left triangle the (3+7)=10 ohm is in parallel with the 10 ohm. Thus for that part Req = 5 ohm. Now (5+10) ohm =15 ohm is in parallel with 30 ohm. Thus Total Req = 10 ohm.
Since per volt resistance R/V= 200, so V/R = i = 1/200. So, total voltage drop = i.(total resistance) = 1/200 . (80X200 +32000) = 80+160 = 240 volts.
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