A 90-V Battery Costs $1 $\$ 11,000 / \mathrm { kWh }$

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced. If this battery supplies a current of 25 mA to the player, what is the
Cost of the energy provided by the battery in dollars per kWh?

A) $\$ 11,000 / \mathrm { kWh }$
B) $\$ 110 / \mathrm { kWh }$
C) $\$ 11 / \mathrm { kWh }$
D) $\$ 1100 / \mathrm { kWh }$

Correct Answer:

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