Question 1134079
Let x be the first sum of money he invested with the interest rate of 5%, 

Interest from the first investment: 5%(x)

Interest from the second investment: (x-2100)(4%)

Total interest:

{{{(0.05)x+(x-2100)(0.04)=177}}}
{{{0.05x+0.04x-84=177}}}
{{{(0.09x)=261}}}
x = 2900

First investment: He invested $2900 with 5% interest rate.
Second investment: He invested $800 with 4% interest rate.



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