Question

Q22. John and David invest Rs. 12000 and Rs. 14000 respectively at the same rate of interest for-11/2
years. If David invest of Rs. 225 more interest than john. Find the rate of interest per annum?

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Answer 1

Answer:

Hope this helps you

Step-by-step explanation:

Let David invested Rs x & Rs y in Bond A & Bond B resp

Rate of interest on Bond A=8%/annum

B=10%/annum

Interest on Bond A=x8/100

=Rs 2x/25

B=y10/100

=Rs y/10

Total Interest =Rs

25

2x

+

10

y

z=

25

2x

+

10

y

Constants: x+y≤12,000

x≥2000

y≥4000

A(2000,4000);B(8000,4000)

C(2000,10000)

at A

Z=

25

2(2000)

+

10

4000

=160+400=560

at B

z=

25

2(8000)

+

10

4000

=640+400=1040

at C

z=

25

2(2000)

+

10

10,000

=160+1000=1160

→z=−1160 (max value)

He must invest Rs 2000 in Bond A,10,000 in Bond B

solution

Answer 2

Step-by-step explanation:

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