Question 535776
Step 1:
Subtract 1350 from 6150 to find out how much he added that year.

 6150
-1350
-----
 4800
</br>
Step 2:
Divide 4800 by 12 to find how much he deposited each month.

4800 / 12
12 goes into 48 4 times. Add the two zeros. 12 goes into 4800 400 times.
</br>
Answer: He donated $400 per month.