Mathematics, 23.08.2021 22:20, ineedhelp2285

The total cost C of electricity for a particular light bulb varies jointly as the time t that the light bulb is used and the cost w per kilowatt-hour, and C=12c when t=50 hours and w=6 per kilowatt-hour. Find C to the nearest cent when t=30 hours and w=8c per kilowatt-hour.

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