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Therefore, P=₹12000

Rate=6%

Time=2 years

Now, its asked the difference of the S.I amount and C.I amount; therefore, first we have to find the S.I.

S.I.= 12000x6x2

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100

= ₹1440

Therefore,

Amount= ₹(12000 + 1440)

= ₹ 13440

Now to find C.I. Amount;

For 1st year;

C.l.= 12000x6x1

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100

= ₹720

Amount=₹(12000 + 720)

=₹12720

For 2nd year;

C.I.= 12720x6x1

*************

100

= ₹763.2

Amount= ₹(12720 + 732.5)

= ₹13452.5

Therefore the difference is;

=C.I. - S.I.

=₹(13452.5 - 13440)

=₹12.5

Therefore, the extra amount to be paid would be ₹12.5

Hope I helped you out!