Question 1151379
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Let x be the amount deposited at 2% interest, in dollars.


Then the amount deposited at 2.5% is 2x dollars.


The total annual interest is the sum of the two particular annual interests


    0.02x + 0.025*(2x) = 700  dollars.


Simplify and solve for x


    0.0.2x + 0.05x = 700

    0.07x          = 700

        x          = {{{700/0.07}}} = 10000.


<U>ANSWER</U>.  $10000 was invested at 2%  annual interest rate and  $20000 was invested at 2.5% annual interest rate.


<U>CHECK</U>.  0.02*10000 + 0.025*20000 = 700  dollars.   ! Precisely correct !
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Solved.