Question

has 20000 to invest she invest 6% the rest at 7% and earn 1280 as interest how much did she invest at each rate ?
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Answer 1

Answer:

Let the second amount =x

⇒

100

12000×10×1

+

100

x×20×1

=

100

(12000+x)×14×1

⇒

100

120000

+

100

20x

=

100

168000+14x

⇒120000+20x=168000+14x

⇒20x−14x=168000−120000

⇒6x=48000

⇒x=8000

Hence total amount invested=12000+8000=20000Rs.

Answer 2

Answer:

hope it helps you

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