zoya invested part of her $25000. advance at 8% annual simple interest and the rest at 9% annual simple interest. if her total yearly interest from both accounts 2135, find the amount invest at each rate.
0.08 X + 0.09Y = 2135
X + Y = 25000
0.08X + 0.09 ( 25000 - X ) = 2135
=> 0.08X - 0.09X = 2135 - 2250
=> X = $11500
=> Y = $13500
Answer : Zoya invested $11500 in the 8% interest account and $13500 in the 9% interest account.
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