Answer:
$23.7
Step-by-step explanation:
Electricity prices increased by 66% in 2009.
Mr and Mrs Smith’s bill was $69.72 after the increase .
The bill before the increase will be 66% / 100% x $69.72
= 0.66 x 69.72
= $46.02
Bill before the increase will be $69.72 - $46.02
=$23.7
