Answer
$\$0.0234$
Work Step by Step
We know that
$P=VI$
$\implies P=120\times 2.6=312W$
We can now find energy consumed per hour as
$E=P\times t$
$\implies E=312\times 1=312W.hr=0.312KW.hr$
As given that for 1 khw.hr, the cost is $\$0.075$
Thus cost for $0.312KW.hr$ is $0.075\times 0.312=\$0.0234$
