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(A) The total simple interest $(SI)$ obtained after $12$ $years$ is calculated as follows:$SI = \frac{P 	imes R_1 	imes T_1}{100} + \frac{P 	imes R

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$20160$

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(A) The total simple interest $(SI)$ obtained after $12$ $years$ is calculated as follows:$SI = \frac{P 	imes R_1 	imes T_1}{100} + \frac{P 	imes R_2 	imes T_2}{100} + \frac{P 	imes R_3 	imes T_3}{100} + \frac{P 	imes R_4 	imes T_4}{100}$Given $P = 9000$,$T_1 = 2$ $years$ at $8 \%$,$T_2 = 4$ $years$ at $9.5 \%$,$T_3 = 2$ $years$ at $11 \%$,and $T_4 = (12 - 2 - 4 - 2) = 4$ $years$ at $12 \%$.$SI = \frac{9000 	imes 8 	imes 2}{100} + \frac{9000 	imes 9.5 	imes 4}{100} + \frac{9000 	imes 11 	imes 2}{100} + \frac{9000 	imes 12 	imes 4}{100}$$SI = 90 	imes (16 + 38 + 22 + 48) = 90 	imes 124 = 11160$Final Amount = Principal + $SI = 9000 + 11160 = 20160$Thus,the final amount is $Rs. 20160$.

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