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#A
Tax is not required as there is 10%off the cost including tax.
#B
[tex]\\ \sf\Rrightarrow 10\%\:of\:1.30[/tex]
[tex]\\ \sf\Rrightarrow 0.13[/tex]
total bill:'
[tex]\\ \sf\Rrightarrow 1.30+0.13=1.43[/tex]