SOLUTION: Ms kaushik invested rs 30000 in total ,part of it at 5% and rest at 8% simple interest. The total interest earned on the investment was rs2100. How much she invested at each rate

Question 1043218: Ms kaushik invested rs 30000 in total ,part of it at 5% and rest at 8% simple interest. The total interest earned on the investment was rs2100. How much she invested at each rate
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Let the amount invested at 5% be x. Then, the amount invested at 8% will be 30000-x. Do you agree?
Now let's let up the equation:
0.05x+0.08(30000-x) = 2100
0.05x+2400-0.08x = 2100
-0.03x = -300 Divide both sides by 0.03, and remember -/- = +
x = 10000 this is the amount invested at 5%
And the amount at 8%:
30000-10000 = 20000 is the amount invested at 8%
:
John
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