Problema Solution
Dr. Donna Dac had 100ˏ000 dollars invested at 5%. how many dollars would she have to invest at 8% so that her total interest per year would equal to 7% of the two investments?
Answer provided by our tutors
let 'x' be the money she would invest at 8%
0.08x + 0.05*100000 = 0.07(x + 100000)
by solving we find
x = $200,000
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she would have to invest $200,000 at 8$.