Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
There is a massive rainstorm lasting 4 days.  There is an area that collects water to prevent flooding in the area.  It ends up overflowing on the 4th day.  The area can hold the equivalent of 6 feet of rain.  It can also drain out the equivalent of 3 inches of rain per day to the nearby river without causing problems.  The first day it rained 10 inches.  The second day it rained twice that much.  On the third day, it rained 50% more than the second day.  It flooded the fourth day before getting a chance to do any of the draining.  What is the minimum amount it rained on the fourth day?

### Response:
 Siku ya pili ilinyesha inchi 10*2=<<10*2=20>>20
Siku ya tatu ilinyesha inchi 20*(1+.50)=<<20*(1+.50)=30>>30
Hivyo katika siku 3 za kwanza, ilinyesha inchi 10+20+30=<<10+20+30=60>>60
Ilitoa maji kwa siku 4-1=<<4-1=3>>3
Hivyo ilitoa maji inchi 3*3=<<3*3=9>>9
Hivyo mwanzoni mwa siku ya nne, kulikuwa na inchi 60-9=<<60-9=51>>51 katika bwawa
Eneo hilo linaweza kuhifadhi inchi 6*12=<<6*12=72>>72
Hivyo ilinyesha angalau 72-51=<<72-51=21>>21 inchi