5. a) The electricity tariff rate fixed by NEA for the consumer using 15 A meter are given alongside. (i) The meter readings of electricity of a household was 3015 units on 1 Magh and 3040 units on 1 Falgun. Find the electricity charge for the month of Magh. Units Service Energy (kWh) charge charge 0-20 Rs 50 Rs 4 21-30 Rs 75 Rs 6.50 A 31-50 Rs 75 Rs 8 (ii) The meter readings of electricity of a household was 6780 units on 1 Chaitra and 6830 units on 1 Baishakh. Find the electricity charge for the month of Chait​