Physics.. Question Below?

[cynthia]

A heater uses 20 A when used in a 110V line. If the power costs 10 cents per kilowatt hour, the cost of running the heater for ten hours is

(a) $ 0.22
(b) $ 0.55
(c) $ 2.20
(d) $ 5.50
(e) none of these

[neo]

using da relation

P=(V)(I)

putting da values
P=2200

now dividing it by 10 cents

cost=2200/10
=220
which makes it $2.20 which is option C)

[ziplock2k]

(c) $ 2.20