Shem makes 2.5 times more money per hour than Kem. If Kem earns $4 per hour, how much does Shem earn for an 8-hour workday?
Shem earns $4 x 2.5 = $<<4*2.5=10>>10 in an hour.
So, Shem earns $10 x 8 = $<<10*8=80>>80 for an 8-hour workday.
#### 80