Question

Dora bought a bottle of nail polish that was marked down by 20 percent from its original price of $4.50. Including a 9 percent sales tax, what is the final cost of the bottle of nail polish? $0.90 $0.98 $3.60 $3.92

Answer 1

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• Final cost of the bottle of nail polish is Rs 3.92

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Firstly, Let us deduct 20% of 4.50 from 4.50

$\implies\sf \: 20\% \: of \: 4.50 \: is \: 0.2 \times 4.50 = 0.90$

$\implies \sf \: 4.50 - 0.90 = 3.60$

The price obtained is the new price without any sale tax.

Now, we need to add 9% of 3.60 to 3.60 to get the final cost.

That is,

$\sf \implies \: 9\% \: of \: 3.60 \: is \: 0.09 \times 3.60 = 0.32$

$\sf \implies \: 3.60 + 0.32 = Rs \: 3.92$

$\therefore$Final cost of the bottle of nail polish is Rs 3.92.