To determine the answer to this item, we are first to convert the given cost in the basis of megajoule. Hence, we are to convert kWh to megajoules.
(1 kWh)(1000W/1kW)(1 J/s / 1 kW)(3600 s / 1 h)(1 MJ/10^6J)
= Php 3,600 kwH
Substituting the known values,
($0.09 /kwH)(3,600 kW/h)
= $324
ANSWER: $324