Answer:
225
Explanation:
We work backwards with this type of question:
- 60% of 15000:
 10%=1500
 60%=10%×6
 60%=1500×6
 60%=9000
- 25% of 60% of 15000:
 25% of 9000
 10%=900
 20%=1800
 25%=1800+450
 25% of 60% of 15000=2250
- 10% of 25% of 60% of 15,000:
 10% of 2250
 10%=225