Gretchen earns $7 per hour at the local pizza shop. If she works 3 hours in an afternoon, how much m

[math_celebrity]

Gretchen earns $7 per hour at the local pizza shop. If she works 3 hours in an afternoon, how much money does she earn?

Earnings = Hourly Wage * Hours Worked
Earnings = $7 * 3
Earnings = $21