the cost of operating an appliance varies jointly as the number of watts drawn, the hours of the operation and the cost per kilowatt-hour. At P8.99 per kilowatt-hour, how much would it cost when a 70-watt desk fan operates for 2 hours?

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  1. c = kwhp
    You do not give any way to evaluate k
    c = 70*2*8.99 = 1258.6k
    Now supply the constant of variation, k.

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  2. Thank u to your helpful answer

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