A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91. How much is invested at 8%.

• 60666.66, 91 = ( ptr /100) + ( 2ptr/100). t = 1, r = 10/100. so, we can find p = 30333.33 and then 2p = 60666.66
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