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.

The krasnapolski is a top-of-the-line hotel in amsterdam, the netherlands. among their many services, they rent bicycles to guests. the bicycle checkout is open 24 hours per day 7 days per week and has 50 bicycles on hand. on average, 10 guests request a bicycle each day, arriving completely randomly at all times of the day during the spring and summer seasons. guests keep bicycles for four days on average, with a standard deviation of two days. how long does a guest on average have to wait for a bike? a. approximately 24 hours b. approximately 0.033 hours c. approximately 4 days d. approximately 47 minutes