165$
Explanation:
The money earned in simple interest is given by the equation:
Sf=Si×r×n
where:
Si,Sf are the initial and final amount of money.
r is the interest rate.
n is the number of years.
We got: n=6 months = 0.5.
So, we earn:
Sf = 22000\times 1.5\times 0.5$
=11000\times 0.015$
=165$