Answer: She earned $ 22,800 commission.
Step-by-step explanation:
Since, she sells a detached house for $200,000 and a cottage for $180,000,
Thus, her total selling = $200,000 + $180,000
= $ 380,000
Also, she earns a 6% commission on each property,
Thus, her total earning = 6% of 380,000
= 0.06 × 380,000
= $ 22,800