Mary earned $97.50 in 6.5 hours. If Mary works for 8 hours, how much can she expect to earn?

We first work out how much Mary will earn in one hour by doing 97.50/6.5 = 15

We then multiply this answer by 8 to work out how much she is expected to earn in 8hours

15*8 = 120

So Mary will earn $120 in 8 hours