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3 years ago

9

You buy a bicycle helmet for $22.26, which includes 6% sales tax. The helmet is discounted 30% off the selling price. What is th

e original price?

2 answers:

schepotkina [342]3 years ago

8 0

Final cost/1.06 = sale price

$\frac{22.26}{1.06} = 21.06$

The sales price is $21.06

Sales price/.70 (70% of the original price) = original price

$\frac{21.06}{.70} = 30.09$

The original price of the helmet was $30.09

Korvikt [17]3 years ago

7 0

6% de 22,26 =
6*22,26/100 =
1,3356
22,26 - 1,3356 = 20,9244
70% de 20,9244 =
70*20,9244/100 =
14,64708 ~ 14,64

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We have been given that you purchased a stereo system for $830. The value of the stereo system decreases 13% each year.

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Let us take natural log of both sides of our equation.

$ln(0.5)=ln(0.87^x)$

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$ln(0.5)=x*ln(0.87)$

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Therefore, after approximately 4.98 years the stereo will be worth half the original value.

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