Question 1038219
Let m,n,and p represent the different amounts. Then:
m+n+p=300000
m=4p
n=300000-m-p=300000-5p
.15m+.1n+.02p=35600
.15(4p)+.1(300000-5p)+.02p=35600
.6p+30000-.5p+.02p=35600
.12p=5600 
p=5600/.12=$46666.67 invested at 2%
4p=$186666.67 invested at 15%
300000-m-p=$66666.66667 invested at 10%!!!!!!!!!