Roberto invested some money at 6%, and then invested $5000 more than twice this amount at 11%. His total annua

Question

Roberto invested some money at 6%, and then invested $5000 more than twice this amount at 11%. His total annual income from the two investments was $4470. How much was invested at 11%?

Answer 1

the annual return is i*c

setting up the algebra
c*.06+(C*2+5000)*.11=4470

c*(.06+.22)=4470-5000*.11
c=(4470-5000*.11)/.28
c=14000

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Answer 2

Do your own homework. You might actually learn something.