How much charge went through it every day

You are operating a radio for 5 hours a day for thirty days. The radio is operated at 9 Volt, 7 Watt turn on at full volume. How much charge went through it every day?

Can someone please explain with equations and answers? Thank you!

7 watts at 9 volts is 9/7 = 1.29 amps, which is 1.29 coulombs per second

5 hours a day is is 5•3600 = 18000 seconds

1.29 C/s x 18000s = 23200 coulombs