If they sell 420kWh for $0.07 per kWh [I believe kWk is a misprint], then each month they make 420*0.07$ = 4.2*7$ = 29.4$.
In a year, i.e. in 12 months, it will be 12 times more money, i.e. 12*29.4$ = 352.8$.
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