Question

3.Mamta has Rs 8000 to invest. She invests Rs 5000 at 3% per annum.At what rate of interst must she invest the remainder in order to obtain 4% interest on the total sum?

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

17/3%

Step-by-step explanation

money left to invest= 8000-5000=3000

4% interest on whole sum = 4/100 x 8000 =320

Hence, Meena wants rs. 320 interest on the whole

We will find out the interest she received with rs. 5000

S.I=P x R x T /100

S.I=5000 x 3 x 1/100

S.I=15000/100

S.I=150

Hence, she received rs. 150 as interest on rs. 5000

interest=320-150=170

Hence, she wants rs. 170 as interest on the whole

We will find out the rate of interest

S.I= P x R x T/100

170= 3000 x R x 1 /100

170=30R

R=17/3

Hence, the rate of interest will be 17/3%