Question

An amount of Rs. 5000 is put into three investments at the rate of interest 6%, 7% and 8%

per annum respectively. The total annual income is Rs. 358. If the combined income from the

first two investments is Rs. 70 more than the income from the third, find the amount of each

investment by matrix method.​

Answer 1

Investment of three companies are

300,350,400 respectively.

Total income is 358

Let income of third investment be x

So income of first and second investment is x+70

A.T.Q

x+x+70=358

2×=358-70

×=288/2

X=144

Income of first and second investment is 214

And income of third investment is 144