Question Number 20 please! :)

Dear Student,

Power of the electric iron (P) = 2 kW

Time for which the iron is operated daily (t) = 3 h

Daily energy consumption (E_daily) ​= P × t
                                                       = 2 kW × 3 h
                                                       = 6 kWh

Total energy consumed in one week (E_week) = 7 × E_daily
                                                                        = 7 × 6
                                                                        = 42 kWh

Total cost = Rs. 4.25 × E_week​
                = Rs. 4.25 × 42
               = Rs. 178.5

Regards