Answer:
The interest he earns in one year is $3000
Explanation:
We are given
Alex has $30,000 in his savings account that earns 10% annually
so,
P=30000
r=10%
t=1 years
now, we can find interest
now, we can plug values
now, we can simplify it
So,
The interest he earns in one year is $3000