Carefully consider the data below: - 8,400 was paid in relation to electricity during the accounting period ending on 31st January 2020. - The cost of the electricity consumption for the period 1 st February 2019 to 31 st January 2020 amounted to 8,500. - The accrued expense in relation to electricity as at 31st January 2020 was 620. Calculate the amount owed in relation to electricity as at 31st January 2019. Select one: a. 520 b. 720 c. 100 d. 1,340