Roberto invested some money at 7%, and then invested $2000 more than twice this amount at 11%. His total annual income from the two investments was $3990. How much was invested at 11%?

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Answer 1 · 2016-04-16T11:15:26

#$13000#

Let the principle sum be #P#

#(7P)/100 + (11(2P+2000))/100 = 3990#

Multiply both sides by 100

#(7P) + 11(2P+2000) = 399000#

#7P+22P+22000=399000#

#29P=377000#

#P=$13000#