Answer:
$90
Explanation:
Earning for 8 hours shoveling snow = $72
Amount per hour = $72/8 = $9
3 hours of babysitting = 2 hours shoveling snow
Babysitting hours in January = 15 hours
Hours of shoveling snow in January = (15/3) x 2 = 10 hours
Amount earned in January = Hours shoveling snow x Hourly Rate
= 10 x $9 = $90
That is, you earn $90 in January.