Physics.. Question Below?

Question

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

Answer 1

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)

Answer 2

(c) $ 2.20