Rajeev buys good worth Rs. 6650. He gets a rebate of 6% on it. After getting the rebate, he pays sales tax @ 10%. Find the amount he will have to pay for the goods.

$$\eqalign{ & {\text{Rebate}} = 6\% \,{\text{of Rs}}.6650 \cr & = {\text{Rs}}{\text{.}}\left( {\frac{6}{{100}} \times 6650} \right) \cr & = {\text{Rs}}{\text{.}}\,399 \cr & {\text{Sales tax}} = {\kern 1pt} 10\% \,{\text{of Rs}}{\text{.}}\left( {6650 - 399} \right) \cr & = {\text{Rs}}{\text{.}}\left( {\frac{{10}}{{100}} \times 6251} \right) \cr & = {\text{Rs}}.625.10 \cr & \therefore {\text{Final}}{\kern 1pt} {\text{amount}} \cr & = {\text{Rs}}{\text{.}}\left( {6251 + 625.10} \right) \cr & = {\text{Rs}}{\text{.}}\,6876.10 \cr} $$