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A trust fund has to invest Rs 30,000 in ...

A trust fund has to invest Rs 30,000 in two different types of bonds. The first bond pays 5% interest per year, and the second bond pays 7% interest per year. Using matrix multiplication, determine how to divide Rs.30,000 among the two types of bonds, if the trust fund must obtain an annual total interest of (a) Rs.1800(b) Rs.2000.

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