[OS] Highest Electricity Bill

#june 2023 exam
#!/bin/bash
#calculate total kWh used from the file electricity.txt for each city, and print the highest number
POTROSUVACKA_BITOLA=`cat electricity.txt | grep ^[0-9] | awk -F\| 'BEGIN {total=0} $2=="Bitola" {total+=$4} END{print total}'`
POTROSUVACKA_PRILEP=`cat electricity.txt | grep ^[0-9] | awk -F\| 'BEGIN {total=0} $2=="Prilep" {total+=$4} END{print total}'`
POTROSUVACKA_KRIVOGASHTANI=`cat electricity.txt | grep ^[0-9] | awk -F\| 'BEGIN {total=0} $2=="Krivogashtani" {total+=$4} END{print total}'`
#I suppose there are no 2 cities tied as far as kWh usage goes, but if there are then we have more ifs, butts & maybz
if [ $POTROSUVACKA_BITOLA -gt $POTROSUVACKA_PRILEP ]
then
        if [ $POTROSUVACKA_BITOLA -gt $POTROSUVACKA_KRIVOGASHTANI ]
        then
                echo "Najgolema potrosuvacka na struja za 2021 godina ima Bitola, i toa ${POTROSUVACKA_BITOLA} kWh!"
        else
                echo "Najgolema potrosuvacka na struja za 2021 godina ima Krivogashtani, i toa ${POTROSUVACKA_KRIVOGASHTANI} kWh!"
        fi
elif [ $POTROSUVACKA_PRILEP -gt $POTROSUVACKA_KRIVOGASHTANI ]
then
        echo "Najgolema potrosuvacka na struja za 2021 godina ima Prilep, i toa ${POTROSUVACKA_PRILEP} kWh!"
else
        echo "Najgolema potrosuvacka na struja za 2021 godina ima Krivogashtani, i toa ${POTROSUVACKA_KRIVOGASHTANI} kWh!"
fi